Div 定时移动

 <!DOCTYPE html>

 <html>

 <head>

     <meta charset="utf-8">

     <meta http-equiv="X-UA-Compatible" content="IE=edge">

     <title></title>

     <script src="js/jquery-1.11.1.js" type="text/javascript"></script>

 </head>

 <style>

   button{width:80px; height:50px; margin: 10px;}

   #divRed{width: 100px; height: 100px; background-color: red; position: absolute; top:90px; left: 0; }

 </style>

 <body>

     <button type="text" id="btnLeft">左移动</button>

     <button type="text" id="btnRight">右移动</button>

     <div id="divRed"></div>

     <script  type="text/javascript" charset="utf-8">

        $(function(){

               var btnL = $('#btnLeft');

               var btnR = $('#btnRight');

               var divR = $('#divRed');

                btnL.click(function(){

                MoveDiv(divR,'left',10,0)

              });

              btnR.click(function(){

                MoveDiv(divR,'left',10,500)

              });

                  function MoveDiv(obj,pos,dir,targer){

                      dir=parseInt(obj.css(pos)) < targer ? dir: -dir;

                        clearInterval(obj.timer)

                      obj.timer=setInterval(function(){

                         var  speed=parseInt(obj.css(pos))+dir;

                         console.log(obj,pos);

                        if(speed > targer && dir > 0 ||  speed < targer && dir < 0  ){ speed = targer;}

                             obj.css(pos,speed +'px');

                           if(speed== targer){  clearInterval(obj.timer)}

                        },30);  

                  }

        })

    </script>

 </body>

 </html>
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