New critical examination of profound understanding, whether there is knowledge specializes in front-end, if there is no specializes in people, say for sure that created an object, congratulations interviewer know you are a small rookie to come, this interview is basically not much I hope. Must be of 4 new process steps are very clear, so as to deeply grasp the interviewer's heart!
After a total of four new stages
1. Create an empty object
varobj=new Object();
2, disposed prototype chain
obj.__proto__= Func.prototype;
3, so that in this point Func obj, and execution of the function body Func.
var result =Func.call(obj);
4, return type Func is determined:
If it is a value type, returns obj. If it is a reference type, and then return the referenced object type.
if (typeof(result) == "object"){
func=result;
}
else{
func=obj;;
}
Source: CSDN
Original: https: //blog.csdn.net/lxcao/article/details/52792466
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