Why is the scope wrong on MS Edge console at breakpoints? - microsoft-edge

Question

I'm finding that in MS Edge when I use the debugger; statement or a breakpoint, the scope of this is always the global scope (e.g. the Window object) regardless of what the scope of this is where the code is actually breaking.
For example, the following code is inside a constructor (thus this is not the global object!):
this.myString = "hello";
// returns the current function scope [object Object]
console.log(this);
// returns "hello"
console.log(this.myString);
var fakeThis = this;
/* In this breakpoint, typing:
* `this` returns [object Window]
* `this.myString` returns undefined
* `fakeThis` returns the correct function scope
* `fakeThis.myString` returns "hello".
*/
debugger;
Is this a known bug with the MS Edge console or is there something specific that might be causing this?

Answer 1

Can't reproduce the problem on my side (using Microsoft Edge 44.18362.1.0), it seems that everything works well on my side, the screenshot like this, and the sample code as below:
<p id="demo"></p>
<script>
// Constructor function for Person objects
function Person(first, last, age, eye) {
this.firstName = first;
this.lastName = last;
this.age = age;
this.eyeColor = eye;
this.myString = "hello";
// returns the current function scope [object Object]
console.log(this);
// returns "hello"
console.log(this.myString);
var fakeThis = this;
/* In this breakpoint, typing:
* `this` returns [object Window]
* `this.myString` returns undefined
* `fakeThis` returns the correct function scope
* `fakeThis.myString` returns "hello".
*/
console.log(this);
console.log(this.myString);
console.log(fakeThis);
console.log(fakeThis.myString);
debugger;
}
// Create a Person object
var myFather = new Person("John", "Doe", 50, "blue");
// Display age
document.getElementById("demo").innerHTML = "My father is " + myFather.age + ".";
</script>
please try to clear the cache and history, then re-test your code. Also, you could create a new page to test above code, check whether they are working on your side.