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05_ Review object defineProperty

2022-07-19 01:36:00 【ID does not exist.】

review Object.defineProperty Method 

    <body>
        <script type="text/javascript" >
            let number = 18
            let person = {
                name:' Zhang San ',
                sex:' male ',
            }
​
            Object.defineProperty(person,'age',{
                // value:18,
                // enumerable:true, // Controls whether attributes can be enumerated , The default value is false
                // writable:true, // Controls whether attributes can be modified , The default value is false
                // configurable:true // Controls whether attributes can be deleted , The default value is false
​
                // When someone reads person Of age Attribute ,get function (getter) It will be called , And the return value is age Value 
                get(){
                    console.log(' Someone read age The attribute is ')
                    return number
                },
​
                // When someone modifies person Of age Attribute ,set function (setter) It will be called , And will receive the specific value of the modification 
                set(value){
                    console.log(' Someone has modified age attribute , And it's worth it ',value)
                    number = value
                }
​
            })
​
            // console.log(Object.keys(person))
​
            console.log(person)
        </script>
    </body>
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