自定义对象属性操作
最基本点运算
let person = { name: 'henry', age: 18, run: function() { console.log('running');
}
}
person.run();
属性的读取：let person = { name: 'henry', age: 18
}console.log(person.name);console.log(person['name']);
//二者输出均为henry
其中方括号里的值可以是个变量：let person = { name: 'henry', age: 18
}let variable = 'name';console.log(person[variable]);
variable = 'age';console.log(person[variable]);
读取对象中的对象属性--点运算：let person = { name: 'henry', age: 18, parents: { papa: 'jack', mama: 'mary'
}
}console.log(person.parents.papa);console.log(person['parents']['mama']);
//输出jack
mary
属性的赋值和读取：let person = { name: 'henry', age: 18
}
person.name = 'tom';
person['age'] = 10console.log(person.name);console.log(person.age);//输出tom
10
属性的查看（使用Object.keys方法）let person = { name: 'henry', age: 18
}console.log(Object.keys(person))；//输出一个数组['name','age']
属性的删除（delete）：let person = { name: 'henry', age: 18
}delete person.name;console.log(person);
增加：let person = { name: 'henry', age: 18
}
person.gender = 'male'
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