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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
                與Java中的傳參幾乎完全一致 ~~~ <script type="text/javascript"> fn1(100); function fn1(a){alert(a);}//100 </script> ~~~ ~~~ <script type="text/javascript"> function fn(w,d){ w.onload = function(){ d.body.innerHTML = 123; } } fn(window,document); </script> ~~~ ~~~ <script type="text/javascript"> //函數也能作為參數 fn(function() { alert(1) }); function fn(a) { if(typeof a === 'number' && a === a) { //NaN也是number,a===a就是排除NaN alert(a + 20); } else if(typeof a === 'String') { alert(a.charat(2)); } else if(typeof a === 'function') { a(); } } </script> ~~~ 課堂練習-1:圖片切換,那之前做的練習,將其變成2份,利用傳參完成 課堂練習-2:模擬購物車點擊增加數量 *** 課后作業-1:購物車拓展 ![](https://box.kancloud.cn/4fdf28136eceab9a21266d7a2ce602cc_586x273.png) 拓展練習: ![](https://box.kancloud.cn/125031149b26f1f55c98879b7a8cb8b5_972x345.gif)
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