從對(duì)象中刪除屬性

delete操作符從對(duì)象中刪除一個(gè)屬性：

var person = {
  firstName:"John",
  lastName:"Doe",
  age:50,
  eyeColor:"blue"
};
delete person.age;  // or delete person["age"];
// Before deletion: person.age = 50, after deletion, person.age = undefined

delete 運(yùn)算符刪除屬性的值和屬性本身。

刪除后，該屬性在重新添加之前無(wú)法使用。

刪除運(yùn)算符旨在用于對(duì)象屬性。它對(duì)變量或函數(shù)沒有影響。

注意： delete 運(yùn)算符不應(yīng)用于預(yù)定義的 JavaScript 對(duì)象屬性。它可能會(huì)使您的應(yīng)用程序崩潰。