jquery源码阅读知识储(8)Javascript引用和作用域的理解

// 引用指向的只能是最原始的对象而不是另一个引用!!
//一切都是对象，哪怕是数字，字符串，数组都是对象!!
//example 1

var items = new Array( "one", "two", "three" ); var itemsRef = items; items = new Array( "new", "array" ); alert( itemsRef );//outputs is "one", "two", "three"

//example 2

var item = "test"; var itemRef = item; item += "ing"; alert( item != itemRef );

 

//javascript中作用域是由函数划分的!!!!

var foo = "test"; if ( true ) { var foo = "new test"; } alert( foo == "new test" );//true function test() { var foo = "old test"; } test(); alert( foo == "new test" );//true