<!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>
</head>
<body>
<div id="natir">你好</div>
<script>
function a(){
console.log(3)
}
function b(){
console.log(4)
}
var natir=document.getElementById("natir")
// natir.onclick= function(){
// console.log(3)
// }
// natir.onclick= function(){
// console.log(4)
// }
natir.addEventListener('click',function(){
console.log(3)
})
natir.addEventListener('click',function(){
console.log(4)
})
</script>
js原生事件不支持给一个元素绑定多个事件； 通过addEventListener来给一个元素绑定多个事件 http://www.html-js.com/article/JavaScript-notes-JavaScript-event-listener
</body>
</html>