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                ``` js中的參數在內部是用一個數組來表示的,在函數體內可以使用arguments對象來訪問這個參數數組 假如你定義的函數有兩個參數,在調用的時候不一定要傳遞兩個參數,一個,三個,不傳都可以 ``` ``` function sayHi() { alert("Hello " + arguments[0] + "," + arguments[1]); } ``` ``` function howManyArgs() { alert(arguments.length); } howManyArgs("string", 45); //2 howManyArgs(); //0 howManyArgs(12); //1 ```
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