原生js完美拖拽，每次刷新可以记住上次拖拽的位置
原生js完美拖拽，每次刷新可以记住上次拖拽的位置原生js完美拖拽，无bug<!doctype html>
<html lang="zh-cn">
<head>
<meta 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>
<body>
<div id="div1" style="width:100px; height:100px; background:#060; border:1px solid #039; position:absolute;">
</div>
</body>
</html>借助cookie来记住每次拖拽结束的位置<!doctype html>
<html lang="zh-cn">
<head>
<meta charset="utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
function setCookie(name,value,expires)
{
var oDate=new Date();
oDate.setDate(oDate.getDate()+expires);
document.cookie=name+'='+value+';expires='+oDate;
}
function getCookie(name)
{
var arr=new Array();
arr=document.cookie.split("; ");
var i=0;
for(i=0; i<arr.length;i++)
{
arr2=arr.split("=");
if(arr2==name)
{
return arr2;
}
}
return '';
}
function removeCookie(name)
{
setCookie(name,'随便什么值，反正都要被删除了',-1);
}
//判断a和b的原因是第一次打开，cookie中并没有相应的参数，所以当有参数时执行，
//a和b只需要判断一个就好了
window.onload=function()
{
var oDiv=document.getElementById('div1');
var a=getCookie('xPosition');
var b=getCookie('yPosition');
if(a)
{
oDiv.style.left=a+'px';
oDiv.style.top=b+'px';
}
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;
setCookie('xPosition',oDiv.offsetLeft,1);
setCookie('yPosition',oDiv.offsetTop,1);
/* alert(document.cookie);
alert(oDiv.offsetLeft);
alert(getCookie('password'));
alert(getCookie('expires'));*/
}
return false;//解决firefox低版本的bug问题,消除默认行为
}
}
</script>
</head>
<body>
<div id="div1" style="width:100px; height:100px; background:#060; border:1px solid #039; position:absolute;">
</div>
</body>
</html>
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