js中英文混合长度的计算以及截取

计算中文以及英文混合字符串的长度

function getByteLen(val) {

var len = 0;

for (var i = 0; i < val.length; i++) {

var a = val.charAt(i);

if (a.match(/[^\x00-\xff]/ig) != null){

len += 2;

}else{

len += 1;

}

}

return len;

}

截取中英文混合的字符串

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