说明:underscore.js
敲underscore.js源码(function(){// BASELINE SETUP
/*Establish the root object,window in the browser,or export on the server:创建一个全局对象,在浏览器中表示window对象,在Node.js中表示global对象:var root=this;*/
var root = this;
/*Save the previous value of the _ v
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