JavaScript前补零操作实例

/** * 前补0操作 * @param number String 待操作字符串 * @param length int 目标长度 */function addZero(number, length) {  var buffer = "";  if (number == "") {    for (var i = 0; i < length; i ++) {      buffer += "0";    }  } else {    if (length < number.length) {      return "";    } else if (length == number.length) {      return number;    } else {      for (var i = 0; i < (length - number.length); i ++) {        buffer += "0";      }      buffer += number;    }  }  return buffer;}

function addZero(str,length){          return new Array(length - str.length + 1).join("0") + str;}