# Javascript generates a random Random Number of up to 13 m bits based on time, and a random number of 13 BITs

Source: Internet
Author: User

Javascript generates a random Random Number of up to 13 m bits based on time, and a random number of 13 BITs

Generates a random m-bit number based on the time. The maximum random number is 13 digits, and the first digit cannot be zero.

`function ran(m) {m = m > 13 ? 13 : m;var num = new Date().getTime();return num.toString().substring(13 - m);}console.log(ran(5));`

Based on the random number generated by the random function of Math, the random number is intercepted by m bits. the maximum number of random numbers generated cannot exceed 16 bits, and the first digit cannot be 0.

`function rand(m) {m = m > 16 ? 16 : m;var num = Math.random().toString();if(num.substr(num.length - m, 1) === '0') {return rand(m);}return num.substring(num.length - m);}console.log(rand(5));`

Generated Based on the random function of Math. There is no limit on the number of digits and the first digit is not 0.

`function rando(m) {var num = '';for(var i = 0; i < m; i++) {var val = parseInt(Math.random()*10, 10);if(i === 0 && val === 0) {i--;continue;}num += val;}return num;}console.log(rando(5));`

Use Javascript programming to generate a random number of less than 10

<Html>
<Title> Generate a random number </title>
<Body>
<Script type = "text/javascript">

For (I = 1; I <11; I ++ ){
// Math. random () is to generate 0 ~ Random number between 1
Var ran = Math. random () * 10; // generate 0 ~ Random Number between 10
Document. write ("nth" + I + "random number:" + ran + "<br> ");

}

</Script>
</Body>
</Html>

Use javascript to generate a random number ranging from 0 to 10.

Document. write (parseInt (10 * Math. random (); // output 0 ~ A random integer between 10

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