您的位置：首页 > Web前端 > JQuery

用js实现类似jquery里的animate动画效果

2012-03-14 10:54 851 查看

效果如下，鼠标移上，先宽度变化，再高度变化，最后透明度变化，鼠标移出，再依次变回去。

// function getstyle(obj,name){
if(obj.currentStyle){
return obj.currentStyle[name];
}else{
return getComputedStyle(obj,false)[name];
}
}

window.onload = function(){
var box = document.getElementById("box");
box.onmouseover = function(){
startrun(box,"width",200,function(){
startrun(box,"height",200,function(){
startrun(box,"opacity","100")
});
});
}
box.onmouseout = function(){
startrun(box,"height",100,function(){
startrun(box,"width",100,function(){
startrun(box,"opacity","30");
});
});
}
}

function startrun(obj,attr,target,fn){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var cur = 0;
if(attr == "opacity"){
cur = Math.round(parseFloat(getstyle(obj,attr))*100);
}else{
cur = parseInt(getstyle(obj,attr));
}
var speed = (target-cur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);

if(cur == target){
clearInterval(obj.timer);
if(fn){
fn();
}
}else{
if(attr == "opacity"){
obj.style.filter = "alpha(opacity="+(cur+speed)+")";
obj.style.opacity = (cur+speed)/100;
}else{
obj.style[attr] = cur + speed + "px";
}
}

},30)
}
// ]]>

要点一：

startrun(obj,attr,target,fn)

box.onmouseover = function(){
startrun(box,"width",200,function(){
startrun(box,"height",200,function(){
startrun(box,"opacity","100")
});
});
}
如上面，函数也可以做为参数使用，就可以达到先执行某个动作，再执行某个动作的效果了。

要点二：

if(cur == target){
clearInterval(obj.timer);
if(fn){
fn();
}
}

当运动到达目标点，关闭定时器，然后就可以执行新的函数了。

最后，上代码

<!DOCTYPE html>
<html>
<head>
<meta charset="gb2312" />
<title>无标题文档</title>
<style>
<!--
body{margin:0; padding:0; font:12px/1.5 arial;}
#box{width:100px; height:100px; position:absolute; background:#06c; left:0;filter:alpha(opacity=30); opacity:0.3;}
-->
</style>
<script>
<!--
function getstyle(obj,name){
if(obj.currentStyle){
return obj.currentStyle[name];
}else{
return getComputedStyle(obj,false)[name];
}
}

window.onload = function(){
var box = document.getElementById("box");
box.onmouseover = function(){
startrun(box,"width",200,function(){
startrun(box,"height",200,function(){
startrun(box,"opacity","100")
});
});
}
box.onmouseout = function(){
startrun(box,"height",100,function(){
startrun(box,"width",100,function(){
startrun(box,"opacity","30");
});
});
}
}

function startrun(obj,attr,target,fn){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var cur = 0;
if(attr == "opacity"){
cur = Math.round(parseFloat(getstyle(obj,attr))*100);
}else{
cur = parseInt(getstyle(obj,attr));
}
var speed = (target-cur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);

if(cur == target){
clearInterval(obj.timer);
if(fn){
fn();
}
}else{
if(attr == "opacity"){
obj.style.filter = "alpha(opacity="+(cur+speed)+")";
obj.style.opacity = (cur+speed)/100;
}else{
obj.style[attr] = cur + speed + "px";
}
}

},30)
}
//-->
</script>
</head>

<body>
<div id="box">
</div>
</body>
</html>

内容来自用户分享和网络整理，不保证内容的准确性，如有侵权内容，可联系管理员处理

标签：

相关文章推荐

新的分享

章节导航