Javascript delete reference type object_javascript skills

As an example below:

Copy code The code is as follows:

var testVar = {
a : {
test: 1
}
},
test1 = {},
test2 = {};

test1. a = testVar.a;
test2.a = testVar.a;
/*
                                                                                                delete test1.a; 1}
console.log(testVar.a); // Object {test: 1}
*/
delete testVar.a;
console.log(test1.a); // Object {test: 1}
console.log(test2.a); // Object {test: 1}
console.log(testVar.a); // undefined

Through testing, it can be seen that if the object deleted by JavaScript delete is a reference type, then it deletes not the referenced object, but the pointer to the referenced object. Therefore, even if you delete testVar.a, the object pointed by test1.a is still not deleted.

For more information on the principles of javascript delete keyword, we recommend:

http://perfectionkills.com/understanding-delete/

Translated version:

http://www.ituring.com.cn/article/7620