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                ~~~ <script> // 實名函數:有函數名的 // function func() {} //==============匿名函數 // 1.函數表達式:把一個函數當做值賦值給變量或者事件綁定 document.body.onclick = function () { // 此處就是匿名函數 }; let fn = function () { // 也是匿名函數 fn代表這個函數 和 function fn類似 }; // 2.自執行函數:函數創建完就立即執行了 // =>(function(n){}) 創建函數,function包一個小括號是為了符合語法規范 // =>...(100) 把創建的函數執行 (function (n) { // n的值是100 })(100) //==============箭頭函數(ES6中新定義的創建函數的方式) let func = (x, y) => { // x和y是形參變量 // 大括號中還是函數體 }; func(10, 20); //=>箭頭函數可以簡化函數編寫的方式:如果函數體中只有一句RETURN,則可以忽略大括號和RETURN let sum = (x, y) => x + y; function sum(x, y) { return x + y; } function func(x) { return function (y) { return x + y; } } let func = x => y => x + y; *** </script> ~~~
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