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标题 js实现类似jquery里animate动画效果的方法
内容
    该实例可实现鼠标移上,先宽度变化,再高度变化,最后透明度变化,鼠标移出,再依次变回去的效果。
    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>
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更新时间:2025/5/20 23:23:12