常用处理函数

//截取字符串(包含中文处理)  str  要截取的字符串 len  截取长度  hasfix  是否加...后缀

function subString(str, len, hasfix){
    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(hasfix && strLength > len){
        newStr += "...";
    }
    return newStr;
}