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                合規國際互聯網加速 OSASE為企業客戶提供高速穩定SD-WAN國際加速解決方案。 廣告
                >[success] # 一個有意思的屬性Function 的length屬性 [MDN](https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Function/length) ~~~ 1.MDN 里面解釋:length 屬性指明函數的形參個數。 2.'arguments.length' 是函數被調用時實際傳參的個數, 'Function.length'指該函數有多少個必須要傳入的參數,即形參的個數 ~~~ >[danger] #### MDN 上的案例 ~~~ console.log(Function.length); // 1 console.log((function() {}).length); // 0 console.log((function(a) {}).length); // 1 console.log((function(a, b) {}).length); // 2 // 0,不計算不定參數 console.log((function(...args) {}).length); // 1,只有在第一個參數之前 // a 形參計算默認值,只能算出a的參數 console.log((function(a, b = 1, c) {}).length); // 1 ~~~
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