[JS]截取字符,中英文都可以

Posted 2022-09-19 wangqiideal

//截取字符，中英文都可以，hasDot=true 返回值的最后还可以添加3个点 
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;