<!DOCTYPE html><html><head lang="en"> ???<meta charset="UTF-8"> ???<title>随机显示颜色</title> ???<style> ???????#div1{ ???????????width: 100px; ???????????height: 100px; ???????} ???</style></head><body onload="change()"><div id="div1"></div></body><script> ???function change(){ ???????var i=Math.random()*10; ???????var div1=document.getElementById("div1"); ???????if(0<i<4){ ???????????div1.style.backgroundColor="red"; ???????} ???????if(4<=i&&i<7){ ???????????div1.style.backgroundColor="yellow"; ???????} ???????if(7<=i&&i<10){ ???????????div1.style.backgroundColor="green"; ???????} ???}</script></html>JS---Math.Random()*10--[0,10)随机变颜色
原文地址：http://www.cnblogs.com/Andy-/p/7587599.html