Detailed explanation of js mixed inheritance examples

1. Application scenario: Suppose there are two objects o1 and o2. If you want to copy the methods and properties of o2 to o1, mixed inheritance is one of the simplest methods

2. Implementation method: Use for...in... to traverse the properties and methods of the o2 object, and assign the properties and methods of o2 to o1

Code implementation

function mixExtend( o1, o2 ){
    for( var key in o2 ){
        o1[key] = o2[key];
    }    return o1;
}


----------//调用一下var o1 ={};

mixExtend( o1, { name:"二狗",age:18,say:function(){
    console.log("大家好，我是二狗");
} });

console.log(o1);

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