<script>

/* 2007-11-28 XuJian */

//截取字符串 包含中文处理

//(串,长度,增加...)

function subString(str, len, hasDot)

{

    var newLength = 0;

    var newStr = "";

    var chineseRegex = /[^\x00-\xff]/g;

    var singleChar = "";

    var strLength = str.replace(chineseRegex,"**").length;

    for(var i = 0;i < strLength;i++)

    {

        singleChar = str.charAt(i).toString();

        if(singleChar.match(chineseRegex) != null)

        {

            newLength += 2;

        }

        else

        {

            newLength++;

        }

        if(newLength > len)

        {

            break;

        }

        newStr += singleChar;

    } 

    if(hasDot && strLength > len)

    {

        newStr += "...";

    }

    return newStr;

}

alert(subString("字符串截取测试 www.jb51.net 是一个收藏精品学习资料的网站",10));

</script>