var a = 'abc'; // 属于window 等同于window.adelete a // 严格模式下抛出异常var aVal = Object.getOwnPropertyDescriptor(window, 'a'); console.log(aVal);console.log(delete a); //false// 非严格模式下，aVal输入如下 // {// value
The delete keywordThe delete operator removes a property from an object. It returns true if the deletion was successful, or false otherwise. The operator only affects the object's own properties, not inherited ones. delete works on object properties, not variables or functions. It cannot delete...
Delete PropertyWrite a JavaScript program to delete the rollno property from the following object. Also print the object before or after deleting the property. Sample object: var student = { name : "David Rayy", sclass : "VI", rollno : 12 };...
delete 操作符用于删除对象的某个属性。 语法: 直接使用delete操作符 delete object.property 或 delete object['property'] 例如: var person = { name: 'abc' age: 18 } delete person.name console.log(person) // {age: 18} 返回值: delete操作符具有返回值,返回值为布尔值,对于所有情况都是true,即使...
在JavaScript中,delete操作符用的比较少,但是还是比较重要的,我本人面试的时候就遇到过关于delete的问题,下面总结一下delete的具体用法。 作用: delete 操作符用于删除对象的某个属性。 语法: 直接使用delete操作符 delete object.property 或
Thedeletekeyword deletes a property from an object: Example constperson = { firstName:"John", lastName:"Doe", age:50, eyeColor:"blue" }; deleteperson.age; Try it Yourself » or delete person["age"]; Example constperson = {
delete 操作符用于删除对象的某个属性。 语法: 直接使用delete操作符 deleteobject.property或deleteobject['property'] AI代码助手复制代码 例如: varperson = {name:'abc'age:18}deleteperson.nameconsole.log(person)// {age: 18} AI代码助手复制代码
delete 运算符用于删除对象的一个属性;如果该属性的值是一个对象,并且没有更多对该对象的引用,该属性所持有的对象最终会自动释放。 尝试一下语法 jsCopy to Clipboard delete object.property delete object[property] 备注: 该语法允许在 delete 运算符之后使用多种类型的表达式,但只有上述形式才能产生有意义的行为...
deleteProperty(target, prop):拦截delete操作符的调用操作。 defineProperty(target, prop, descriptor):拦截Object.defineProperty()方法的调用操作。 getOwnPropertyDescriptor(target, prop):拦截Object.getOwnPropertyDescriptor()方法的调用操作。 getPrototypeOf(target):拦截Object.getPrototypeOf()方法的调用操作。
>varobj={};// empty object>obj.foo=123;// create property `foo`, set it to 123123>obj.foo123 复制 您也可以用它来调用方法: >'hello'.toUpperCase()'HELLO' 复制 在上面的例子中,我们已经在值'hello'上调用了方法toUpperCase()。 原始值与对象 ...