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  • js多物体运动之淡入淡出效果

    <!DOCTYPE html>
    <html lang="zh">
    <head>
        <meta charset="UTF-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1.0" />
        <meta http-equiv="X-UA-Compatible" content="ie=edge" />
        <title>Document</title>
    </head>
    <style>
             div{width:200px;height: 200px;margin: 20px;float: left;
             background-color: red;filter:alpha(opacity:30);opacity: 0.3;}
          
    </style>
    <body> 
                <div></div>
                <div></div>
                <div></div>
                <div></div>        
               
    </body>
    <script type="text/javascript" src="jquery.js"></script>
    <script type="text/javascript">
        window.onload=function(){
            var oDiv=document.getElementsByTagName('div');
            for(var i=0;i<oDiv.length;i++){
                oDiv[i].alpha=30;
                oDiv[i].onmouseover=function(){
                    
                    startMove(this,100);
                };
                    oDiv[i].onmouseout=function(){
                    startMove(this,30);
                };
            }
                    
        };
        
        
            function startMove(obj,iTarget){
                clearInterval(obj.timer);
                obj.timer=setInterval(function(){
                    var speed=(iTarget-obj.alpha)/6;
                    speed=speed>0?Math.ceil(speed):Math.floor(speed);
                    if(obj.alpha==iTarget){
                        clearInterval(obj.timer);
                    }else{
                        obj.alpha+=speed;
                        obj.style.filter='alpha(opacity:'+obj.alpha+')';
                        obj.style.opacity=obj.alpha/100;
                    }
                },30);
            }
                
    </script>
    </html>

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  • 原文地址:https://www.cnblogs.com/kangshuai/p/7231730.html
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