Method 1: Native
adc.js content is as follows:
var hello = "H9";
html.html
<script>
var s = document.createElement("script");
s.src = "abc.js";
document.head.appendChild(s);
s.addEventListener("load",function(){
// 等待s的load事件加载完响应，防止未加载完就调用出错
console.log(hello);
})
setTimeout(function(){//或者使用定时器保证其载入完后调用（不安全，不如监听事件好）
console.log(hello);
},1000);
// $.getScript("abc.js");
</script>
Method 2: jquery.js
$.getScript("abc.js",function(){ alert("heheheh"); console.log(hello); });
<script type="text/javascript" src="../jquery.js"></script>
<script type="text/javascript">
$(function()
{
$('#loadButton').click(function(){
$.getScript('new.js',function(){
newFun('"Checking new script"');//这个函数是在new.js里面的，当点击click后运行这个函数
});
});
});
</script>
</head>
<body>
<button type="button" id="loadButton">Load</button>
Method 3 ：require.js
require.js shares version 2.1.1. Note that it is for use in large projects. In this case, just use jquery.
index.html
main.js
console.log("你好世界");
require(["js1","js2","js3"],function () {
// 是异步加载导入。js后缀可以省略
console.log("你们加载完了么？");
var total = num1+num2+num3;
console.log(total);
hello1();
hello2();
hello3();
})
Using requireJs can easily import js files, but you should pay attention to the problem of variable name and method name conflicts in js files. Cause: Browser js files share the global scope, and variable names and method names in the scope may be overwritten
![[Web front-end] Node.js quick start](https://img.php.cn/upload/course/000/000/067/662b5d34ba7c0227.png)
