<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>对象</title> </head> <body> <script> //Object.defineProperty() //定义新属性或者修改原有的属性 let obj = { id:1, name:'huawei mate30', price:3000, } Object.defineProperty(obj,'adress',{ value:'湖北省武昌区', }) Object.defineProperty(obj,'id',{ //不允许修改属性值 writable:false, }) obj.id=2; console.log(obj) Object.defineProperty(obj,'price',{ writable:false, enumerable:false,//是否可以枚举 就是能不能遍历处理 configurable:false, //不允许price属性被删除 以及不能修改 writable,enmerable的值 }) delete obj.price delete obj.name console.log(obj) Object.defineProperty(obj,'price',{ writable:true, enumerable:true, configurable:false, }) console.log(obj); </script> </body> </html>
