如何解决javascript截取字符串中文乱码问题

function subString(str, len, hasDot) //js截取中英文字符串无乱码 { 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; } //var subdescription = subString("js截取中英文字符串无乱码",10,true) //document.write(subdescription);