<html xmlns="http://www.w3.org/1999/xhtml" >
<head>
<title>标题页</title>
<SCRIPT LANGUAGE="JavaScript">
function compare(a, b, n)
{
var c=a.length>b.length?b:a;
//减少循环
if(b==c) b=a; a=c;
if(!n) n=1;
//创建数组，逐字比较文本
var mm = new Array();
for(var i=0; i<a.length; i++)
{
for(var j=i+n; j<=a.length; j++)
{
var s = a.substring(i, j);
if(b.indexOf(s)==-1)
{
if(s.length>n) {
mm[mm.length] = a.substring(i, j-1);
i = j-2; }
break;
}
else {
if(j==a.length) {
mm[mm.length]=s; }
}
} }
return mm.Unique().join(","); //去除数组里的重复项
}
//为Array数组定义方法Unique
Array.prototype.Unique = function()
{
var a = {};
for(var i=0; i<this.length; i++)
{
if(typeof a[this[i]] == "undefined")
a[this[i]] = 1;
}
this.length = 0;
for(var i in a)
this[this.length] = i;
return this;
};
//定义变量，并调用比较方法
var a = "北京要举办奥运会";
var b = "上海要举办世博会";
alert("返回的结果："+ compare(a, b, 2));
</SCRIPT>
</head>
<body>
</body>
</html>
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