js空格处置函数

<script type="text/javascript" language="javascript">
    var s = "   fOo bar ";
    for(var index = 0; index < s.length; index++){
        alert(s.charCodeAt(index));
        alert(s.charAt(index));
    }
    //把左边的空格删除
    function ltrim(s){
        var flg = 0;
        var lstr = '';
        while(s.charCodeAt(flg) == 32 )flg++;
        alert(flg);
        for(var index = 0; index < s.length - flg; index++)
            lstr+= s.charAt(flg+index);
        return lstr;
    }
    //把右边的空格删除
    function rtrim(s){
        var flg = 0;
        var rstr = '';
        var strLength = s.length;
        while( s.charAt(strLength-1-flg) == ' ')flg++;
        for(var index = 0; index < s.length - flg; index++)
            rstr+= s.charAt(index);
        return rstr;
    }
    //利用正则表达式删除空格
    function replaceSpace(str){
        return str.replace(/\s/g,'');
    }
    //删除所有空格
    function removeAllSpace(str){
        var localString = '';
        for(var index = 0; index<str.length; index++)
            if(str.charCodeAt(index)!= 32){
                localString += str.charAt(index);
            };
    return localString;
    }
</script>