ioslh

window.onload=function(){
	var table=document.createElement("table");
	for(var i=1;i<10;i++){
		var tr=document.createElement("tr");
		if(i%2==0){
			tr.className="dark";
		}else{			
		}
		for(var j=1;j<i+1;j++){
			var td=document.createElement("td");

ioslh

// 传统的方法
window.onload=function(){
	var tab=document.getElementById("tab");
	var a=tab.getElementsByTagName("a");
	var div=tab.getElementsByTagName("div");
	for(var i=0;i<a.length;i++){
		a[i].index=i;
		a[i].onmouseover=function(){
			for(var j=0;j<a.length;j++){
				a[j].className="";

ioslh

window.onload=function(){
	var oBtn=document.getElementsByTagName("button")[0];
	oBtn.onclick=function(){
		changeLineColor(document.getElementById("num").value);
	}
	changeLineColor();
};
function changeLineColor(num){
	var n=Number(num)>0 && Number(num)<6?Number(num):2;
	var colors=["yellow","red","blue","green","grey"];

ioslh

window.onload=function(){
	//获取页面元素
	var aBtn=document.getElementsByTagName("button");
	var box=document.getElementById("box");
	var tip=document.getElementById("tips");
	//定义三个函数，用三种方式循环改变背景颜色
	var fn=[function(){
		//第一种，遍历取出数组中的颜色值
		var colors=['yellow','red','black','blue','green'];
		var i=0;