原生js拖拽 

<!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>
<script type="text/javascript">
window.onload=function()
{
var oDiv=document.getElementById('div1');
oDiv.onmousedown=function(ev)
{
    var oEvent=ev||event;
    var x=0;
    var y=0;
    x=oEvent.clientX-oDiv.offsetLeft;
    y=oEvent.clientY-oDiv.offsetTop;
    document.onmousemove=function(ev)
    {
        var oEvent=ev||event;
        var out1=oEvent.clientX-x;
        var out2=oEvent.clientY-y;
        
        var oWidth=document.documentElement.clientWidth-oDiv.offsetWidth;
        var oHeight=document.documentElement.clientHeight-oDiv.offsetHeight;

        if(out1<0)
        {out1=0;}
        else if (out1>oWidth)
        {
            out1=oWidth;
        }
        
        
        if(out2<0)
        {out2=0;}
        else if (out2>oHeight)
        {
            out2=oHeight;
        }
        
        oDiv.style.left=out1+'px';
        oDiv.style.top=out2+'px';
    }
        document.onmouseup=function()
    {
        document.onmousemove=null;
        document.onmouseup=null;    
    }
    return false;//解决firefox低版本的bug问题
}
}
</script>
</head>

 

posted @ 2017-01-04 15:57  北执  阅读(392)  评论(0)  编辑  收藏  举报