动态加载JavaScript

顾名思义就是根据条件判断来决定要不要加载JavaScript，判断很简单就是if嘛，关键是加载：

引用

<script language="javascript" type="text/javascript">
var nSel=document.getElementById('my_check_element');
if(nFluentSel==null){
var script = document.createElement("script");
script.defer = "true";
script.language = "javascript";
script.title = "myLoad";
script.type = "text/javascript";
script.src = "https://www.example.com/myload.js";
var head = document.getElementsByTagName("head")[0];
head.appendChild(script);
}
</script>