函数对外提供接口的一个方法是，将函数内部的变量、内部函数挂载到window全局对象下即可
(function(){
function $(){
//do sth.
}
window.$ = $;
})();
$();//succeed
Created
August 25, 2016 12:43
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js 学习笔记(杂)
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