题目：实现页面中表格的隔行变色
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
</style>
</head>
<body>
<ul id="box">
<li>奇数行</li>
<li>偶数行</li>
<li>奇数行</li>
<li>偶数行</li>
<li>奇数行</li>
<li>偶数行</li>
</ul>
<input type="button" id="even" value="偶数变色">
<input type="button" id="odd" value="奇数变色">
</body>
<script>
//获取按钮
var oEven = document.getElementById("even");
var oOdd = document.getElementById("odd");
//获取box下面的li
var aLi = document.querySelectorAll("#box li");
//点击事件
oEven.onclick = function(){
for(var i=0;i<aLi.length;i++)
{
if( (i+1) % 2 ==0 ){
aLi[i].style.cssText="background:pink;";
}else{
aLi[i].style.background = "green";
}
}
}
oOdd.onclick = function(){
for(var i=0;i<aLi.length;i++)
{
if( (i+1) % 2 !=0 ){
aLi[i].style.background = "blue";
}else{
aLi[i].style.background = "orange";
}
}
}
</script>
</html>