Zi 字媒體
2017-07-25T20:27:27+00:00
in的用法主要是用來判斷一個物件裡是不是有這個變數
例如下面程式碼，alert出yes
var car = new Object();
car.name = "Johnson";
car.color = "green";
car.number = "XXX-3333";
if("color" in car) alert("yes");
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