变速动画函数封装
匀速动画：每次步数都是10 (var step=10;)
变速(缓动)动画：每次的步数是用当前位置和目标位置相减 var step=(target-current)/10;
代码如下:
<!DOCTYPE html>
<html lang="en"> <head>
<meta charset="UTF-8">
<title>title</title>
<style>
* {
margin: 0;
padding: 0;
} div {
margin-top: 20px;
width: 200px;
height: 100px;
background-color: green;
position: absolute;
left: 0;
top: 0;
}
</style>
</head> <body>
<input type="button" value="移动到400px" id="btn1" />
<input type="button" value="移动到800px" id="btn2" />
<div id="dv">
<script src="common.js"></script>
<script>
//点击按钮移动div my$("btn1").onclick = function () {
animate(my$("dv"), 400);
};
my$("btn2").onclick = function () {
animate(my$("dv"), 800);
}; //变速动画函数 function animate(element, target) {
//清理定时器
clearInterval(element.timeId);
element.timeId = setInterval(function () {
//获取元素的当前位置
var current = element.offsetLeft;
//移动步数
var step = (target - current) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
current += step;
element.style.left = current + "px";
if (current == target) {
//清理定时器
clearInterval(element.timeId);
}
//测试代码
console.log("目标位置:" + target + "，当前位置:" + current + "，步数:" + step);
}, 20);
} </script>
</div>
</body> </html>