1.自定义右键菜单：
<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
* {margin:0; padding:0; list-style:none;}
#div1 {position:absolute; width:80px; background:#CCC; border:1px solid black; display:none;}
</style>
<script>
document.oncontextmenu=function (ev)
{
var oEvent=ev||event;
var oDiv=document.getElementById('div1'); oDiv.style.display='block';
oDiv.style.left=oEvent.clientX+'px';
oDiv.style.top=oEvent.clientY+'px'; return false;
}; document.onclick=function ()
{
var oDiv=document.getElementById('div1'); oDiv.style.display='none';
};
</script>
</head>
<body>
<div id="div1">
<ul>
<li>aaa</li>
<li>bbb</li>
<li>ccc</li>
<li>ddd</li>
</ul>
</div>
</body>
</html>
2、只能输入数字的文本框：
<script>
window.onload=function ()
{
var oTxt=document.getElementById('txt1'); oTxt.onkeydown=function (ev)
{
var oEvent=ev||event;
//alert(oEvent.keyCode);
//0- 48
//9- 57
//如果 用户按的 不是退格 并且 也不是数字 if(oEvent.keyCode!=8 && (oEvent.keyCode<48 || oEvent.keyCode>57))
{
return false;
}
};
};
</script>
</head>
<body>
<input type="text" id="txt1" />
3、拖拽：
<style>
#div1 {width:200px; height:200px; background:red; position:absolute;}
</style>
<script>
window.onload=function ()
{
var oDiv=document.getElementById('div1'); var disX=0;
var disY=0; oDiv.onmousedown=function (ev)
{
var oEvent=ev||event; disX=oEvent.clientX-oDiv.offsetLeft;
disY=oEvent.clientY-oDiv.offsetTop; document.onmousemove=function (ev)
{
var oEvent=ev||event;
var l=oEvent.clientX-disX;
var t=oEvent.clientY-disY; if(l<0)
{
l=0;
}
else if(l>document.documentElement.clientWidth-oDiv.offsetWidth)
{
l=document.documentElement.clientWidth-oDiv.offsetWidth;
} if(t<0)
{
t=0;
}
else if(t>document.documentElement.clientHeight-oDiv.offsetHeight)
{
t=document.documentElement.clientHeight-oDiv.offsetHeight;
} oDiv.style.left=l+'px';
oDiv.style.top=t+'px';
}; document.onmouseup=function ()
{
document.onmousemove=null;
document.onmouseup=null;
}; return false;
};
};
</script>
</head>
<body>
<div id="div1"></div>