关于多个li调用不成功？
就是这个老师不是刚开始吧多余的li都删除了，我是在原来的基础上做着个例子，发现第一次调用startMove就成功，第二次在设置高的startMove就失败，没有效果，？？？
3 回答
对的,在调用startMove方法的第二遍的时候this 指代的不是当前这个li标签了 稍微改一下就行 用一个指针存一下:
window.onload = function() {
var aLi = document.getElementsByTagName('li');
var _this;
for(var i = 0; i < aLi.length; i++) {
aLi[i].timer = null;
aLi[i].onmouseover = function() {
console.log(this);
_this = this;
startMove(this, 'width', 400, function() {
console.log(this);
startMove(_this, 'height', 200, function() {
startMove(_this, 'opacity', 100);
});
});
}
aLi[i].onmouseout = function() {
_this = this;
startMove(this, 'opacity', 30, function() {
startMove(_this, 'height', 100, function() {
startMove(_this, 'width', 200);
});
});
}
}
}
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>js链式动画</title>
</head>
<script>
window.onload=function(){
var aLi=document.getElementsByTagName('li');
for(var i=0;i<aLi.length;i++){
aLi[i].timer=null;
aLi[i].onmouseover=function(){
startMove(this,'width',400,function(){
startMove(this,'height',200,function(){
startMove(this,'opacity',100);
});
});
}
aLi[i].onmouseout=function(){
startMove(this,'opacity',30,function(){
startMove(this,'height',100,function(){
startMove(this,'width',200);
});
});
}
}
}
//var timer=null;
function startMove(obj,attr,iTarget,fn){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var icur=0;
if(attr=='opacity'){
icur=Math.round(parseFloat(getStyle(obj,attr))*100);
}else{
icur=parseInt(getStyle(obj,attr));
}
//获取速度
var speed=(iTarget-icur)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
// 动画停止
if(icur==iTarget){
clearInterval(obj.timer);
if(fn){
fn();
}
}else{
if(attr=='opacity'){
obj.style.filter='alpha(opacity:'+(icur+speed)+')';
obj.style.opacity=(icur+speed)/100;
}else{
obj.style[attr]=icur+speed+'px';
}
}
},30)
}
function getStyle(obj,attr){
if (obj.currentStyle) {
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
</script>
<style>
ul ,li{
list-style:none;
}
ul li{
width:200px;
height:100px;
background:yellow;
margin-bottom:20px;
border: 4px solid #000;
filter: alpha(opacity:30);
opacity: 0.3;
}
</style>
<body>
<ul>
<li id='li1'></li>
<li></li>
<li></li>
</ul>
</body>
</html>
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