点击返回按钮不能返回怎么解决？

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
</head>
<style>
#div1{width:200px;
height:200px;
background:red;
position:absolute;
left:0;
top:200px;
}
</style>
<script>
window.onload=function(){
    var oDiv=document.getElementById("star");
    var oDiv=document.getElementById("back");
    star.onclick= function(){
  starmove(300);
}
    
 back.onclick= function(){
  starback(0);
}

 
    var timer=null
     
function starmove(iTarget){
    clearInterval(timer);
     var oDiv=document.getElementById("div1");
     timer=setInterval(function(){
     	var star=document.getElementById('star');
    
             if(oDiv.offsetLeft<300){
                  oDiv.style.left = oDiv.offsetLeft+10+"px";
     				star.id="back";
     				var back=document.getElementById('back');
     				back.value='返回';
    }else {
      clearInterval(timer);
    }
     
          
         },30)
}
function starback(iTarget){
    clearInterval(timer);
     var oDiv=document.getElementById("div1");
     timer=setInterval(function(){
             if(oDiv.offsetLeft>0){
                  oDiv.style.left = oDiv.offsetLeft-10+"px";
     
    }else {
      clearInterval(timer);
    }
     
          
         },30)
}
}
</script>
<body>
<input  id="star" type="button" value="开始"/>

<div id="div1">
</div>
</body>
</html>
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点击返回按钮不能返回怎么解决？

1回答
