对字符串进行Html编码

/*
===========================================
//对字符串进行Html编码
===========================================
*/
String.prototype.toHtmlEncode = function()
{
        var str = this;

        str=str.replace(/&/g,"&");
        str=str.replace(/</g,&quot;<&quot;);
        str=str.replace(/>/g,&quot;>&quot;);
        str=str.replace(//'/g,&quot;&apos;&quot;);
        str=str.replace(//&quot;/g,&quot;&quot;&quot;);
        str=str.replace(//n/g,&quot;<br>&quot;);
        str=str.replace(// /g,&quot;&nbsp;&quot;);
        str=str.replace(//t/g,&quot;&nbsp;&nbsp;&nbsp;&nbsp;&quot;);

        return str;
}