JavaScript automatically generates random strings containing numbers and characters

JavaScript automatically generates random strings containing numbers and characters_javascript skills

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Release： 2016-05-16 16:15:10

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The example in this article describes how javascript can automatically generate a random string containing numbers and characters. Share it with everyone for your reference. The details are as follows:

The two functions Math.random() and Math.floor() are mainly used here

Math.random() -- Returns a pseudo-random number between 0 and 1. It may be 0, but it is always less than 1, [0,1)

Math.floor() -- round down and discard the decimal value

Method to implement random multi-digit numbers:

Copy code The code is as follows:

/**

* 

* Randomly generated numbers 

* 

*@param num Number of generated digits 
*/ 

function randomNumber(num){ 

           return '' Math.floor(Math.random() * num) ; 

}

javascript randomly generates characters

The following examples are random characters appearing in the random A-Z / a-z range

Copy code The code is as follows:

/**

*

* Randomly generated 

*

*@param data json data Example: {"start":0,"end":2,"number":5,"upper":true} 

*@param start Start subscript 

*@param end End subscript 

*@param number Number of generated digits 

*@param upper Whether it is uppercase or not. The default is lowercase 

​*/ 

function randomLetter(data){ 

var letterData = ""; 

var lowercase = new Array("a","b","c","d","e","f","g","h","i","g","k", "l","m","n","o","p","q","r","s","t","u","v","w","x ","y","z"); 

var uppercase = new Array("A","B","C","D","E","F","G","H","I","J","K", "L","M","N","O","P","Q","R","S","T","U","V","W","X ","Y","Z"); 

var start = data.start; 

var end = data.end; 

var number = data.number; 

var upper = data.upper; 

var length = end - start; 

for(var i= 0;i < number; i ){ 

      var index = Math.floor(Math.random() * length) start;  

      var letter = "";  

If(upper){ 

             letter = uppercase[index]; 

          }else{ 

              letter = lowercase[index]; 

              letterData = letter;                        
}  

Return letterData; 

}

Quote:

Copy code The code is as follows:alert(new Date().Format("yyyy-MM-dd hh:mm :ss"));

I hope this article will be helpful to everyone’s JavaScript programming design.