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                返回值與Java基本一致 ~~~ <script type="text/javascript"> function fn1(){ return 100; } alert(fn1());// 100,得到的是函數的返回值 </script> ~~~ *** 返回值還可以是函數 ~~~ <script type="text/javascript"> function fn1(){ return function(){ alert(1); } } alert(fn1()); </script> ~~~ 得到的是一個函數字符串 如果先運行函數中返回的函數 ~~~ <script type="text/javascript"> fn1()(10); function fn1(){ return function(a){ alert(a); // 10 } } </script> ~~~ *** ### 未定義問題 ~~~ <script type="text/javascript"> function fn1(){ }//默認有return,就是未定義 alert(fn1()); </script> ~~~ #### return小結: 1)函數名+括號:fn1()==>return后面的值 2)所有函數默認返回值都是未定義 3)return后任何代碼都不會執行 *** ### 函數中的arguments ~~~ <script type="text/javascript"> fn1(1,2,3);//實參 function fn1(a,b,c){//形參--可以不寫,不寫的話,存在arguments里(實參的集合) //alert(arguments);//object arguments alert(arguments.length);//3 alert(arguments[0]);//1 } </script> ~~~ *** 課堂練習-1:求和 ~~~ <script type="text/javascript"> // 參數個數無法確定時候用 alert(sum(1,2,3)); alert(sum(1,2,3,4)); function sum (){ var n = 0; for(var i = 0;i < arguments.length;i++){ n += arguments[i]; } return n; } </script> ~~~
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