1. Direct quotation from the page
2. Dynamically write to the page
document.write('')
document.write('')
3. Simulate the included function
function include(path){
var a=document.createElement("script");
a.type = "text/javascript";
a.src=path;
var head=document.getElementsByTagName("head")[0];
head.appendChild(a);
}
include("a.js")
include("b.js")
4.js modular programming
Require.js methods