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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                ### 執行上下文 1. 執行上下文:一般來說執行上下文代表執行環境 2. 每次函數被調用創建新的執行上下文,包括調用他本身 **調用函數之后,函數內部執行的順序** 1. 創建階段 2. 執行階段 **創建階段** 1. 初始化作用域鏈 2. 創建變量,函數,和參數 3. 求this的值 ~~~ function foo(i) { var a = 'hello'; var b = function privateB() { }; function c() { } } foo(22); ~~~ 當調用foo(22)時,創建狀態像下面這樣: ~~~ fooExecutionContext= { scopeChain={.....}, variableObject: { arguments:{ 0 : 22, length: 1 }, i: 22, a: undefind, b:undefind, c:pointer to function c() }, this: {....} } ~~~
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