<!doctype?html>
<html>
<head>
<meta?charset="utf-8">
<title>鏈?zhǔn)竭\(yùn)動(dòng)</title>
<style>
*{
padding:0;
margin:0;
list-style:none;
}
#box{
margin:0?auto;
background:orange;
width:200px;
height:200px;
opacity:0.3;
filter:alpha(opacity:30);
margin-bottom:20px;
}
</style>
<script>
window.onload=function(){
var?div=document.getElementById("box");
div.onmouseover=function(){
change(this,'width',400,function(){
change(this,'height',400);
});
}
}
function?getStyle(obj,attr){
if(obj.currentStyle){
return?obj.currentStyle[attr];
}
else{
return?getComputedStyle(obj,false)[attr];
}
}
function?change(obj,attr,target,fn){
clearInterval(obj.timer);
obj.timer?=?setInterval(function(){
var?val?=?0;
if(attr?==?'opacity'){
val?=?Math.round(parseFloat(getStyle(obj,attr))*100);
}
else{
val?=?parseInt(getStyle(obj,attr));
}
var?speed?=?(target-val)/8;
speed?=?speed>0???Math.ceil(speed)?:?Math.floor(speed);
if(val?==?target){
clearInterval(obj.timer);
//判斷是否傳入了fn
if(fn){
fn();
}
}
else{
if(attr?==?'opacity'){
obj.style.filter?=?'alpha(opacity:'?+?val+speed?+?')';
obj.style.opacity?=?(val+speed)/100;
}
else{
obj.style[attr]?=?val?+?speed?+"px";
}
}
},30)
}
</script>
</head>
<body>
<div?id="box"></div>
</body>
</html>
2022-03-25
lt;scriptgt;親為啥那個(gè)top值那樣設(shè)置呢？怎么理解？
2016-06-19
別直接用This,將this賦值給一個(gè)變量，如var that=this;
2016-05-31
但是如果是for循環(huán)里面的話 ?this就不能改啊
2016-05-12
window.onload=function(){ ????var?div=document.getElementById("box"); ????div.onmouseover=function(){ ????????change(this,'width',400,function(){ ????????????change(this,'height',400); ????????}); ????} }這里的外層change()可以傳this,但是到了里層change()時(shí)，this就代表window對(duì)象了?？梢愿某蒬iv