random.js

这是《JavaScript学习源代码》一书的源代码

// get a random number from 0.0 to 1.0

var rand1 = Math.random(); 

// multiply by 10 to make it between 0.0 and 10.0               

var rand2 = rand1 * 10; 


// round it up to make it between 1 and 10                      

var rand3 = Math.ceil( rand2 );

// add each part to a string

var str = "Random float [rand1]: " + rand1 + "\n";
str += "Specify range [rand2]: " + rand2 + "\n";
str += "Random integer [rand3]: " + rand3;

// display the string

alert(str);