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                            ### 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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