用JavaScript删除选中行

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<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<style type="text/css">*{font-size:14px}button{margin:3px}</style>
<script type="text/javascript">

var mytable=null,mytable2=null;

window.onload=function(){
mytable=new CTable("tbl",10);
mytable2=new CTable("tbl2",6);
}

Array.prototype.each=function(f){for(var i=0;i<this.length;i++) f(this[i],i,this)}

function $A(arrayLike){
for(var i=0,ret=[];i<arrayLike.length;i++) ret.push(arrayLike[i]);
return ret
}

Function.prototype.bind = function() {
var __method = this, args = $A(arguments), object = args.shift();
return function() {
return __method.apply(object, args.concat($A(arguments)));
}
}

function CTable(id,rows){
this.tbl=typeof(id)=="string"?document.getElementById(id):id;
if (rows && /^\d+$/.test(rows)) this.addrows(rows)
}

CTable.prototype={
addrows:function(n){ //随机添加n个tr
new Array(n).each(this.add.bind(this))
},
add:function(){ //添加1个tr
var self=this;
var tr = self.tbl.insertRow(-1),td1= tr.insertCell(-1),td2= tr.insertCell(-1),td3= tr.insertCell(-1);
var chkbox=document.createElement("INPUT")
chkbox.type="checkbox"
chkbox.onclick=self.highlight.bind(self)
td1.appendChild(chkbox)
td1.setAttribute("width","35")
td2.innerHTML=Math.ceil(Math.random()*99)
td3.innerHTML=Math.ceil(Math.random()*99)
},
del:function(){ //删除所选tr
var self=this
$A(self.tbl.rows).each(function(tr){if (self.getChkBox(tr).checked) tr.parentNode.removeChild(tr)})
},

highlight:function(){ //设置tr的背景色
var self=this;
var evt=arguments[0] || window.event
var chkbox=evt.srcElement || evt.target
var tr=chkbox.parentNode.parentNode
chkbox.checked?self.setBgColor(tr):self.restoreBgColor(tr)
},

getChkBox:function(tr){ //从tr得到 checkbox对象
return tr.cells[0].firstChild
},
restoreBgColor:function(tr){
tr.style.backgroundColor="#ffffff"
},
setBgColor:function(tr){
tr.style.backgroundColor="#c0c0c0"
}
}

function f(a,b){
var sumRow=function(row){return Number(row.cells[1].innerHTML)+Number(row.cells[2].innerHTML)};
return sumRow(a)>sumRow(b)?1:-1;
}

</script>

</head>
<body>

<button onClick="javascript:mytable.add()">添加一行</button>
<button onClick="javascript:mytable.del()">删除选定行</button>
<br/><br/>
<table width=100%>
<tr>
<td valign="top"><table border id="tbl" width="80%"></table></td>
<td valign="top"><table border id="tbl2" width="80%"></table></td>
</tr>
</table>
<br/><br/>

</body>
</html>

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