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                            [with](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Statements/with "JavaScript查找某個未使用命名空間的變量時，會通過作用域鏈來查找，作用域鏈是跟執行代碼的context或者包含這個變量的函數有關。'with'語句將某個對象添加到作用域鏈的頂部，如果在statement中有某個未使用命名空間的變量，跟作用域鏈中的某個屬性同名，則這個變量將指向這個屬性值。如果沒有同名的屬性，則將拋出ReferenceError異常。")

>[danger]不推薦使用`with`，在 ECMAScript 5[嚴格模式](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Strict_mode)中該標簽已被禁止。推薦的替代方案是聲明一個臨時變量來承載你所需要的屬性。
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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