js自动点击按钮：
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
</head>
<body>
<button id="btn1">btn1</button>
<button id="btn2">btn2</button>
<button id="btn3">btn3</button>
<button id="btn4">btn4</button>
<div id = "btn11"></div>
<div id = "btn22"></div>
<div id = "btn33"></div>
<div id = "btn44"></div>
</body>
<script type="text/javascript">
function b(){
var btn1 = window.document.getElementById("btn1");
var btn2 = window.document.getElementById("btn2");
var btn3 = window.document.getElementById("btn3");
var btn4 = window.document.getElementById("btn4");
var o1,o2,o3;
btn1.onclick=function(){
a(1);
o1 = setTimeout(() => {
btn2.onclick();
}, 1000);
}
btn2.onclick=function(){
a(2);
o2 = setTimeout(() => {
btn3.onclick();
}, 1000);
}
btn3.onclick=function(){
a(3);
o3 = setTimeout(() => {
btn4.onclick();
}, 1000);
}
btn4.onclick=function(){
a(4);
}
btn1.onclick();
}
function a(a){
document.getElementById("btn"+a+""+a).append("btn"+a);
var o = "o"+a;
clearTimeout(o);
}
b();
</script>
</html>
