1：Object.create() usage

Use an existing object to create a new object containing it , Assign the object to the prototype of the new object .

        let obj = {
    
            name:'anny'
        }
        let newObj = Object.create(obj);
        console.log(newObj.name). // Output ：anny

Attention list ：

• The first parameter can only be Object Type or null, Otherwise, an error will be reported
• The second parameter is optional , Be similar to Object.defineProperties Second parameter of .

		let obj = {
    
            name:'anny'
        }
        let newObj = Object.create(obj,{
    
            name:{
    
                value:"tony",
                writable:true // Is it possible to write 
            }
        });
        console.log(newObj.name) // Output tony

2：Object.create() Principle specification

2.1： standard

1. Judge whether it is Object perhaps null
2. Create a new object
3. Point the prototype of the new object to the incoming object
4. Judge the second parameter Properties It's true
5. Return the newly created object

2.2： Realization

		function myCreate(obj,Properties){
    

            // Judge whether it is Object perhaps null
            if(!(obj instanceof Object)&&obj!==null){
    
                throw TypeError
            }

            // Create a new object （ Equivalent to new Object()）
            let newObj = {
    }

            // Point the prototype of the new object to the incoming object 
            newObj.__proto__ = obj;

            // If the second parameter Properties It's true 
            if(Properties&&Properties!==undefined){
    
                Object.defineProperties(newObj,Properties)
            }

            // Return the newly created object 
            return newObj;
        }

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