185800****0分享是一种美德

Archive for the category: 6.前端开发

解决ios不支持按钮:active方法

十月 10th, 2019 6.前端开发
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:active伪类是在类似’mousedown’事件触发的时机生效的，而手机上并没有’mousedown’事件，取而代之的只有’touchstart’和’touchend’。

只需要给这个a链接的touch系列的任意事件touchstart/touchend绑定一个空的匿名方法即可

var a = document.getElementsByTagName('button');
for(var i = 0; i < a.length; i++) {
    a[i].addEventListener('touchstart',function(){},false);
}

 

添加以上代码，touch按下去后，发现a的active效果生效了

CSS样式形状

四月 22nd, 2019 6.前端开发
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PS:代码来源于网络。

CSS能够生成各种形状。正方形和矩形很容易，因为它们是 web 的自然形状。添加宽度和高度，就得到了所需的精确大小的矩形。添加边框半径，你就可以把这个形状变成圆形，足够多的边框半径，你就可以把这些矩形变成圆形和椭圆形。

我们还可以使用 CSS 伪元素中的 ::before 和 ::after，这为我们提供了向原始元素添加另外两个形状的可能性。通过巧妙地使用定位、转换和许多其他技巧，我们可以只用一个 HTML 元素在 CSS 中创建许多形状。

1.正方形

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#square {
  width: 100px;
  height: 100px;
  background: red;
}

2.长方形

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#rectangle {
  width: 200px;
  height: 100px;
  background: red;
}

3.圆形

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#circle {
  width: 100px;
  height: 100px;
  background: red;
  border-radius: 50%
}

4.椭圆形

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#oval {
  width: 200px;
  height: 100px;
  background: red;
  border-radius: 100px / 50px;
}

5.上三角

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#triangle-up {
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-bottom: 100px solid red;
}

6.下三角

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#triangle-down {
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-top: 100px solid red;
}

7.左三角

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#triangle-left {
  width: 0;
  height: 0;
  border-top: 50px solid transparent;
  border-right: 100px solid red;
  border-bottom: 50px solid transparent;
}

8.右三角

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#triangle-right {
  width: 0;
  height: 0;
  border-top: 50px solid transparent;
  border-left: 100px solid red;
  border-bottom: 50px solid transparent;
}

9.左上角

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#triangle-topleft {
  width: 0;
  height: 0;
  border-top: 100px solid red;
  border-right: 100px solid transparent;
}

10.右上角

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#triangle-topright {
  width: 0;
  height: 0;
  border-top: 100px solid red;
  border-left: 100px solid transparent;
}

11.左下角

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#triangle-bottomleft {
  width: 0;
  height: 0;
  border-bottom: 100px solid red;
  border-right: 100px solid transparent;
}

12.右下角

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#triangle-bottomright {
  width: 0;
  height: 0;
  border-bottom: 100px solid red;
  border-left: 100px solid transparent;
}

13.箭头

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#curvedarrow {
  position: relative;
  width: 0;
  height: 0;
  border-top: 9px solid transparent;
  border-right: 9px solid red;
  transform: rotate(10deg);
}
#curvedarrow:after {
  content: "";
  position: absolute;
  border: 0 solid transparent;
  border-top: 3px solid red;
  border-radius: 20px 0 0 0;
  top: -12px;
  left: -9px;
  width: 12px;
  height: 12px;
  transform: rotate(45deg);
}

14.梯形

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#trapezoid {
  border-bottom: 100px solid red;
  border-left: 25px solid transparent;
  border-right: 25px solid transparent;
  height: 0;
  width: 100px;
}

15.平行四边形

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#parallelogram {
  width: 150px;
  height: 100px;
  transform: skew(20deg);
  background: red;
}

16.星星 (6角)

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#star-six {
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-bottom: 100px solid red;
  position: relative;
}
#star-six:after {
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-top: 100px solid red;
  position: absolute;
  content: "";
  top: 30px;
  left: -50px;
}

17.星星 (5角)

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#star-five {
  margin: 50px 0;
  position: relative;
  display: block;
  color: red;
  width: 0px;
  height: 0px;
  border-right: 100px solid transparent;
  border-bottom: 70px solid red;
  border-left: 100px solid transparent;
  transform: rotate(35deg);
}
#star-five:before {
  border-bottom: 80px solid red;
  border-left: 30px solid transparent;
  border-right: 30px solid transparent;
  position: absolute;
  height: 0;
  width: 0;
  top: -45px;
  left: -65px;
  display: block;
  content: '';
  transform: rotate(-35deg);
}
#star-five:after {
  position: absolute;
  display: block;
  color: red;
  top: 3px;
  left: -105px;
  width: 0px;
  height: 0px;
  border-right: 100px solid transparent;
  border-bottom: 70px solid red;
  border-left: 100px solid transparent;
  transform: rotate(-70deg);
  content: '';
}

18.五边形

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#pentagon {
  position: relative;
  width: 54px;
  box-sizing: content-box;
  border-width: 50px 18px 0;
  border-style: solid;
  border-color: red transparent;
}
#pentagon:before {
  content: "";
  position: absolute;
  height: 0;
  width: 0;
  top: -85px;
  left: -18px;
  border-width: 0 45px 35px;
  border-style: solid;
  border-color: transparent transparent red;
}

19.六边形

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#hexagon {
  width: 100px;
  height: 55px;
  background: red;
  position: relative;
}
#hexagon:before {
  content: "";
  position: absolute;
  top: -25px;
  left: 0;
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-bottom: 25px solid red;
}
#hexagon:after {
  content: "";
  position: absolute;
  bottom: -25px;
  left: 0;
  width: 0;
  height: 0;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  border-top: 25px solid red;
}

20.八边形

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#octagon {
  width: 100px;
  height: 100px;
  background: red;
  position: relative;
}
#octagon:before {
  content: "";
  width: 100px;
  height: 0;
  position: absolute;
  top: 0;
  left: 0;
  border-bottom: 29px solid red;
  border-left: 29px solid #eee;
  border-right: 29px solid #eee;
}
#octagon:after {
  content: "";
  width: 100px;
  height: 0;
  position: absolute;
  bottom: 0;
  left: 0;
  border-top: 29px solid red;
  border-left: 29px solid #eee;
  border-right: 29px solid #eee;
}

21.爱心

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#heart {
  position: relative;
  width: 100px;
  height: 90px;
}
#heart:before,
#heart:after {
  position: absolute;
  content: "";
  left: 50px;
  top: 0;
  width: 50px;
  height: 80px;
  background: red;
  border-radius: 50px 50px 0 0;
  transform: rotate(-45deg);
  transform-origin: 0 100%;
}
#heart:after {
  left: 0;
  transform: rotate(45deg);
  transform-origin: 100% 100%;
}

22.无穷大

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#infinity {
  position: relative;
  width: 212px;
  height: 100px;
  box-sizing: content-box;
}
#infinity:before,
#infinity:after {
  content: "";
  box-sizing: content-box;
  position: absolute;
  top: 0;
  left: 0;
  width: 60px;
  height: 60px;
  border: 20px solid red;
  border-radius: 50px 50px 0 50px;
  transform: rotate(-45deg);
}
#infinity:after {
  left: auto;
  right: 0;
  border-radius: 50px 50px 50px 0;
  transform: rotate(45deg);
}

23.菱形

1555920562-1011-cr6nbch1a1
#diamond {
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-bottom-color: red;
  position: relative;
  top: -50px;
}
#diamond:after {
  content: '';
  position: absolute;
  left: -50px;
  top: 50px;
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-top-color: red;
}

代码部署后可能存在的BUG没法实时知道，事后为了解决这些BUG，花了大量的时间进行log 调试，这边顺便给大家推荐一个好用的BUG监控工具 Fundebug。

24.钻石1

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#diamond-shield {
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-bottom: 20px solid red;
  position: relative;
  top: -50px;
}
#diamond-shield:after {
  content: '';
  position: absolute;
  left: -50px;
  top: 20px;
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-top: 70px solid red;
}

25.钻石2

1555920570-6519-41iu9fau8q
#cut-diamond {
  border-style: solid;
  border-color: transparent transparent red transparent;
  border-width: 0 25px 25px 25px;
  height: 0;
  width: 50px;
  box-sizing: content-box;
  position: relative;
  margin: 20px 0 50px 0;
}
#cut-diamond:after {
  content: "";
  position: absolute;
  top: 25px;
  left: -25px;
  width: 0;
  height: 0;
  border-style: solid;
  border-color: red transparent transparent transparent;
  border-width: 70px 50px 0 50px;
}

26.钻戒

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#diamond-narrow {
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-bottom: 70px solid red;
  position: relative;
  top: -50px;
}
#diamond-narrow:after {
  content: '';
  position: absolute;
  left: -50px;
  top: 70px;
  width: 0;
  height: 0;
  border: 50px solid transparent;
  border-top: 70px solid red;
}

27. 鸡蛋

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#egg {
  display: block;
  width: 126px;
  height: 180px;
  background-color: red;
  border-radius: 50% 50% 50% 50% / 60% 60% 40% 40%;
}

28.吃豆人

1555920570-4027-lix78qjb2p
#pacman {
  width: 0px;
  height: 0px;
  border-right: 60px solid transparent;
  border-top: 60px solid red;
  border-left: 60px solid red;
  border-bottom: 60px solid red;
  border-top-left-radius: 60px;
  border-top-right-radius: 60px;
  border-bottom-left-radius: 60px;
  border-bottom-right-radius: 60px;
}

29.对话泡泡

1555920570-2424-5eb6e64ju8
#talkbubble {
  width: 120px;
  height: 80px;
  background: red;
  position: relative;
  -moz-border-radius: 10px;
  -webkit-border-radius: 10px;
  border-radius: 10px;
}
#talkbubble:before {
  content: "";
  position: absolute;
  right: 100%;
  top: 26px;
  width: 0;
  height: 0;
  border-top: 13px solid transparent;
  border-right: 26px solid red;
  border-bottom: 13px solid transparent;
}

30. 12点 爆发

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#burst-12 {
  background: red;
  width: 80px;
  height: 80px;
  position: relative;
  text-align: center;
}
#burst-12:before,
#burst-12:after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 80px;
  width: 80px;
  background: red;
}
#burst-12:before {
  transform: rotate(30deg);
}
#burst-12:after {
  transform: rotate(60deg);
}

31. 8点 爆发

1555920577-6692-5c7v2mdrgb
#burst-8 {
  background: red;
  width: 80px;
  height: 80px;
  position: relative;
  text-align: center;
  transform: rotate(20deg);
}
#burst-8:before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 80px;
  width: 80px;
  background: red;
  transform: rotate(135deg);
}

32.太极

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#yin-yang {
  width: 96px;
  box-sizing: content-box;
  height: 48px;
  background: #eee;
  border-color: red;
  border-style: solid;
  border-width: 2px 2px 50px 2px;
  border-radius: 100%;
  position: relative;
}
#yin-yang:before {
  content: "";
  position: absolute;
  top: 50%;
  left: 0;
  background: #eee;
  border: 18px solid red;
  border-radius: 100%;
  width: 12px;
  height: 12px;
  box-sizing: content-box;
}
#yin-yang:after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: red;
  border: 18px solid #eee;
  border-radius: 100%;
  width: 12px;
  height: 12px;
  box-sizing: content-box;
}

33.徽章丝带

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#badge-ribbon {
  position: relative;
  background: red;
  height: 100px;
  width: 100px;
  border-radius: 50px;
}
#badge-ribbon:before,
#badge-ribbon:after {
  content: '';
  position: absolute;
  border-bottom: 70px solid red;
  border-left: 40px solid transparent;
  border-right: 40px solid transparent;
  top: 70px;
  left: -10px;
  transform: rotate(-140deg);
}
#badge-ribbon:after {
  left: auto;
  right: -10px;
  transform: rotate(140deg);
}

34.太空入侵者（电脑游戏名）

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#space-invader {
  box-shadow: 0 0 0 1em red,
  0 1em 0 1em red,
  -2.5em 1.5em 0 .5em red,
  2.5em 1.5em 0 .5em red,
  -3em -3em 0 0 red,
  3em -3em 0 0 red,
  -2em -2em 0 0 red,
  2em -2em 0 0 red,
  -3em -1em 0 0 red,
  -2em -1em 0 0 red,
  2em -1em 0 0 red,
  3em -1em 0 0 red,
  -4em 0 0 0 red,
  -3em 0 0 0 red,
  3em 0 0 0 red,
  4em 0 0 0 red,
  -5em 1em 0 0 red,
  -4em 1em 0 0 red,
  4em 1em 0 0 red,
  5em 1em 0 0 red,
  -5em 2em 0 0 red,
  5em 2em 0 0 red,
  -5em 3em 0 0 red,
  -3em 3em 0 0 red,
  3em 3em 0 0 red,
  5em 3em 0 0 red,
  -2em 4em 0 0 red,
  -1em 4em 0 0 red,
  1em 4em 0 0 red,
  2em 4em 0 0 red;
  background: red;
  width: 1em;
  height: 1em;
  overflow: hidden;
  margin: 50px 0 70px 65px;
}

35.电视

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#tv {
  position: relative;
  width: 200px;
  height: 150px;
  margin: 20px 0;
  background: red;
  border-radius: 50% / 10%;
  color: white;
  text-align: center;
  text-indent: .1em;
}
#tv:before {
  content: '';
  position: absolute;
  top: 10%;
  bottom: 10%;
  right: -5%;
  left: -5%;
  background: inherit;
  border-radius: 5% / 50%;
}

36.雪佛龙

1555920578-4004-8fxu68r0ac
#chevron {
  position: relative;
  text-align: center;
  padding: 12px;
  margin-bottom: 6px;
  height: 60px;
  width: 200px;
}
#chevron:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 51%;
  background: red;
  transform: skew(0deg, 6deg);
}
#chevron:after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  height: 100%;
  width: 50%;
  background: red;
  transform: skew(0deg, -6deg);
}

37.放大镜

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#magnifying-glass {
  font-size: 10em;
  display: inline-block;
  width: 0.4em;
  box-sizing: content-box;
  height: 0.4em;
  border: 0.1em solid red;
  position: relative;
  border-radius: 0.35em;
}
#magnifying-glass:before {
  content: "";
  display: inline-block;
  position: absolute;
  right: -0.25em;
  bottom: -0.1em;
  border-width: 0;
  background: red;
  width: 0.35em;
  height: 0.08em;
  transform: rotate(45deg);
}

38.Facebook图标

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#facebook-icon {
  background: red;
  text-indent: -999em;
  width: 100px;
  height: 110px;
  box-sizing: content-box;
  border-radius: 5px;
  position: relative;
  overflow: hidden;
  border: 15px solid red;
  border-bottom: 0;
}
#facebook-icon:before {
  content: "/20";
  position: absolute;
  background: red;
  width: 40px;
  height: 90px;
  bottom: -30px;
  right: -37px;
  border: 20px solid #eee;
  border-radius: 25px;
  box-sizing: content-box;
}
#facebook-icon:after {
  content: "/20";
  position: absolute;
  width: 55px;
  top: 50px;
  height: 20px;
  background: #eee;
  right: 5px;
  box-sizing: content-box;
}

39.月亮

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#moon {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  box-shadow: 15px 15px 0 0 red;
}

40.旗

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#flag {
  width: 110px;
  height: 56px;
  box-sizing: content-box;
  padding-top: 15px;
  position: relative;
  background: red;
  color: white;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-align: center;
  text-transform: uppercase;
}
#flag:after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-bottom: 13px solid #eee;
  border-left: 55px solid transparent;
  border-right: 55px solid transparent;
}

41.圆锥

1555920585-9424-v16dp8ajj6
 #cone {
  width: 0;
  height: 0;
  border-left: 70px solid transparent;
  border-right: 70px solid transparent;
  border-top: 100px solid red;
  border-radius: 50%;
}

42.十字架

1555920585-9326-87bq1dfxge
#cross {
  background: red;
  height: 100px;
  position: relative;
  width: 20px;
}
#cross:after {
  background: red;
  content: "";
  height: 20px;
  left: -40px;
  position: absolute;
  top: 40px;
  width: 100px;
}

43.根基

1555920590-1712-yw2u85cogf
 #base {
  background: red;
  display: inline-block;
  height: 55px;
  margin-left: 20px;
  margin-top: 55px;
  position: relative;
  width: 100px;
}
#base:before {
  border-bottom: 35px solid red;
  border-left: 50px solid transparent;
  border-right: 50px solid transparent;
  content: "";
  height: 0;
  left: 0;
  position: absolute;
  top: -35px;
  width: 0;
}

44.指示器

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#pointer {
  width: 200px;
  height: 40px;
  position: relative;
  background: red;
}
#pointer:after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 0;
  border-left: 20px solid white;
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent;
}
#pointer:before {
  content: "";
  position: absolute;
  right: -20px;
  bottom: 0;
  width: 0;
  height: 0;
  border-left: 20px solid red;
  border-top: 20px solid transparent;
  border-bottom: 20px solid transparent;
}

45.锁

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#lock {
  font-size: 8px;
  position: relative;
  width: 18em;
  height: 13em;
  border-radius: 2em;
  top: 10em;
  box-sizing: border-box;
  border: 3.5em solid red;
  border-right-width: 7.5em;
  border-left-width: 7.5em;
  margin: 0 0 6rem 0;
}
#lock:before {
  content: "";
  box-sizing: border-box;
  position: absolute;
  border: 2.5em solid red;
  width: 14em;
  height: 12em;
  left: 50%;
  margin-left: -7em;
  top: -12em;
  border-top-left-radius: 7em;
  border-top-right-radius: 7em;
}
#lock:after {
  content: "";
  box-sizing: border-box;
  position: absolute;
  border: 1em solid red;
  width: 5em;
  height: 8em;
  border-radius: 2.5em;
  left: 50%;
  top: -1em;
  margin-left: -2.5em;
}

 

FormData接口

三月 2nd, 2019 6.前端开发
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FormData 接口提供了一种表示表单数据的键值对的构造方式，经过它的数据可以使用 XMLHttpRequest.send() 方法送出，本接口和此方法都相当简单直接。如果送出时的编码类型被设为 "multipart/form-data"，它会使用和表单一样的格式。

你也可以将它直接传递给构造器 URLSearchParams， if you want to generate query parameters in the way a <form> would do if it were using simple GET submission.

An object implementing FormData can directly be used in a for...of structure, instead of entries(): for (var p of myFormData) is equivalent to for (var p of myFormData.entries()).

构造函数

FormData()
创建一个新的 FormData 对象。

 

方法

FormData.append()
Appends a new value onto an existing key inside a FormData object, or adds the key if it does not already exist.
FormData.delete()
Deletes a key/value pair from a FormData object.
FormData.entries()
Returns an iterator allowing to go through all key/value pairs contained in this object.
FormData.get()
Returns the first value associated with a given key from within a FormData object.
FormData.getAll()
Returns an array of all the values associated with a given key from within a FormData.
FormData.has()
Returns a boolean stating whether a FormData object contains a certain key.
FormData.keys()
Returns an iterator allowing to go through all keys of the key/value pairs contained in this object.
FormData.set()
Sets a new value for an existing key inside a FormData object, or adds the key/value if it does not already exist.
FormData.values()
Returns an iterator allowing to go through all values contained in this object.

 

 

createJS开发小游戏

九月 21st, 2018 6.前端开发
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效果图：（录屏的时候有点卡）

910706-20170707164034456-1593675354

 demo：

https://github.com/beidan/canvas

游戏整体思路实现

1. 实现一个无缝连接的背景图，模拟出汽车在加速的状态

this.backdrop = new createjs.Bitmap(bg);
this.backdrop.x = 0;
this.backdrop.y = 0;
this.stage.addChild(that.backdrop);
this.w = bg.width;
this.h = bg.height;

//创建一个背景副本，无缝连接
var copyy = -bg.height;
this.copy = new createjs.Bitmap(bg);
this.copy.x = 0;
this.copy.y = copyy;  //在画布上y轴的坐标为负的背景图长
//使用createjs的tick函数，逐帧刷新舞台
createjs.Ticker.addEventListener("tick", tick);
function tick(e) {
   if (e.paused !== 1) {
        //舞台逐帧逻辑处理函数
        that.backdrop.y = that.speed + that.backdrop.y;
        that.copy.y = that.speed + that.copy.y;

        if (that.copy.y > -40) {
              that.backdrop.y = that.copy.y + copyy;
        }
        if (that.copy.y > -copyy - 100) {
              that.copy.y = copyy + that.backdrop.y;
        }
        that.stage.update(e);
    }          
}

2. 随机绘制障碍物

由于一条跑道肯定会有很多障碍物，对于超出屏幕的障碍物我们要进行‘资源回收’，否则游戏到后面会越来越卡顿。

// 删除越界的元素
for (var i = 0, flag = true, len = that.props.length; i < len; flag ? i++ : i) {
    if (that.props[i]) {
        if (that.props[i].y > height + 300) {
            that.stage.removeChild(that.props[i]);
            that.props.splice(i, 1);
            flag = false;
        } else {
            flag = true;
        }
    }
}

一共有3条赛道，我们不能出现3个道具同时出现在水平线上，因此我们会随机取1～2个值绘制障碍物。所有游戏我们都应该有参数去控制它的难易程度，免得临上线的时候，老板体验之后觉得游戏太难了……那就非常地尴尬了。 因此，我们会设置加速物体，减速物体，炸弹出现的比例，后期可以调整这个比例来设置游戏的难易程度。

var num = parseInt(2 * Math.random()) + 1, i;
    for (i = 0; i < num; i++) {
        var type = parseInt(10 * Math.random()) + 1;

        // 设置道具出现比例
        if (type == 1) {
            /绘制炸弹
        } else if ((type >= 2) && (type <= 5)) {
            //绘制加速道具
        } else if ((type >= 6) && (type <= 10)) {
            //绘制减速道具
        }
    }

第一次绘制完障碍物之后，会随机时间绘制下一次的障碍物。

var time = (parseInt(3 * Math.random()) + 1);  //随机取1～3整数
// 随机时间绘制障碍物
setTimeout(function () {
    that.propsTmp = [];  //清空
    that.drawObstacle(obj);
}, time * 400);  //400ms ~ 1200ms

 

3.碰撞检测

我们用一个数组来存放汽车占的矩形区域，障碍物占的矩形区域，在每一次tick的时候循环遍历数组，看是否有重叠的，若有重叠，则发生了碰撞。

createjs的一些小知识：

1. 暂停和恢复舞台渲染

createjs.Ticker.addEventListener(“tick”, tick); 
function tick(e) { 
    if (e.paused === 1) { 
    //处理 
    }
}     
createjs.Ticker.paused = 1; //在函数任何地方调用这个，则会暂停tick里面的处理 
createjs.Ticker.paused = 0; //恢复游戏

 

2. 由于汽车会有加速，减速，弹气泡的效果。因此我们把这几个效果绘制在同一个container中，方便统一管理,对这些效果设置name属性，之后可以直接使用getChildByName获取到该对象。

container.name = ‘role’; //设置name值
car = this.stage.getChildByName(“role”);  //使用name值方便获取到该对象

 

3. 预加载 preload （createjs 的 preload 非常的实用）

一开始是自己写的预加载，后来发现createjs里面对图片是有跨域处理的，自己处理跨域的img就比较麻烦，所以直接使用createjs的预加载。

//放置静态资源的数组
var manifest = [
    {src: __uri('./images/car_prop2_tyre@2x.png'), id: 'tyre'}
];
var queue = new createjs.LoadQueue();
queue.on('complete', handleComplete, this);
queue.loadManifest(manifest);
//资源加载成功后,进行处理
function handleComplete() {
   var tyre = queue.getResult('tyre');  //拿到加载成功后的img
}

一般做一个游戏，我们正常都会构建一个游戏类来承载。 下面是一个游戏正常有的接口:

;(function () {
    function CarGame(){}
    CarGame.prototype = {
        init:function(manifest) {
            this.preLoad(manifest);  //资源预加载
            //时间倒计时
            this.prepare(3, 3);  //倒计时3秒
            this.bindEvent(); 
        },
        render:function() {
           this.drawBg(bg1);
           this.drawRole(car, effbomb, effquick);
           this.drawObstacle(obj);
        },
        //在游戏结束的时候批量销毁
        destroy:function(){
            //移除tick事件
            createjs.Ticker.removeEventListener("tick", this.tick);
            //暂停里程，倒计时
            clearInterval(this.changem);
            clearTimeout(this.gametime);
        }，
        //由于期间用户可能切出程序进行其他操作，因此都需要一个暂停的接口
        pause:function() {
            //暂停里程，倒计时
            clearInterval(this.changem);
            clearTimeout(this.gametime);

            //暂停页面滚动
            createjs.Ticker.paused = 1;
        },
        //重新开始游戏
        reStart:function(){
           this.destroy();
           this.init(manifest);
        },
        gameOver:function(){
           //显示爆炸效果
           var car = this.stage.getChildByName("role");
           car.getChildByName('bomb').visible = true;
           car.getChildByName('quick').visible = false;
           this.destroy();
        }
    }
})()

 

转载：https://www.cnblogs.com/beidan/p/7122731.html

HTML5声音引擎Howler.js简介

九月 19th, 2018 6.前端开发
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Howler.js是一个不错的HTML5声音引擎。功能强大，性能不错，用起来也很方便。

1. 官网

https://howlerjs.com/ 其代码托管在GitHub上。

2. 兼容性

Howler默认使用Web Audio，但在IE上可以自动转为HTML 5 Audio。这点很是贴心。

3. 声音激活

移动端的Safari和Chrome都禁止网页自动播放声音，必须通过用户的操作，touch, click等触发。Howler可以设置成自动捕捉用户操作激活（解禁）声音播放。

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