JavaScript pre-complement 0 walkthrough _javascript Tips

The example in this article describes the method of JavaScript pre-complement 0 operation. Share to everyone for your reference. Specifically as follows:

Many times in order to display the format, you need to perform a 0 operation in the case of a string with a bit of dissatisfaction.

1. Traditional code

/**
 * Front 0 Operation
 * @param number string to be manipulated string
 * @param length int target length
/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;
}

2. This code is more concise

function Addzero (str,length) {return        
  new Array (Length-str.length + 1). Join ("0") + str;
}

I hope this article will help you with your JavaScript programming.