<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport"
content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<script src="../node_modules/bluebird/js/browser/bluebird.js"></script>
<style>
.ball {
width: 40px;
height: 40px;
border-radius: 50%;
}
.ball1 {
background: red;
}
.ball2 {
background: yellow;
}
.ball3 {
background: green;
}
</style>
</head>
<body>
<div class="ball ball1" style="margin-left: 0;"></div>
<div class="ball ball2" style="margin-left: 0;"></div>
<div class="ball ball3" style="margin-left: 0;"></div>
<script>
let ball1 = document.querySelector('.ball1');
let ball2 = document.querySelector('.ball2');
let ball3 = document.querySelector('.ball3');
//方式一
// function animate(ball , distance ,cb) {
// setTimeout(function () {
// let marginLeft = parseInt(ball.style.marginLeft,10);
// if(marginLeft === distance){
// cb && cb()
// }else {
// if(marginLeft < distance){
// marginLeft++;
// }else{
// marginLeft--;
// }
// ball.style.marginLeft = marginLeft+'px';
// animate(ball,distance,cb)
// }
// },13)
// }
// animate(ball1,100,function () {
// animate(ball2,200,function () {
// animate(ball3,300,function () {
// animate(ball3,150,function () {
// animate(ball2,150,function () {
// animate(ball1,150,function () {
// })
// })
// })
// })
// })
// })
//方式二
//npm install bluebird
let Promise = window.Promise;
function promiseAnimate(ball,distance) {
return new Promise(function (resolve,reject) {
function _animate() {
setTimeout(function () {
let marginLeft = parseInt(ball.style.marginLeft,10);
if(marginLeft === distance){
resolve()
}else {
if(marginLeft < distance){
marginLeft++;
}else{
marginLeft--;
}
ball.style.marginLeft = marginLeft+'px';
_animate()
}
},13)
}
_animate()
})
}
promiseAnimate(ball1,100)
.then(function () {
return new promiseAnimate(ball2,200)
})
.then(function () {
return new promiseAnimate(ball3,300)
})
.then(function () {
return new promiseAnimate(ball3,150)
})
.then(function () {
return new promiseAnimate(ball3,150)
})
.then(function () {
return new promiseAnimate(ball2,150)
})
.then(function () {
return new promiseAnimate(ball1,150)
})
</script>
</body>
</html>promise應用一
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