what is this in javascript
// this = current execution context (window in browser, global in nodejs)
console.log(this) // window object
function foo () {
console.log(this); // object calling this function
}
foo(); // undefined
o={ foo }
o.foo(); // 'o' object loggedjavascript this
// In web browsers, the window object is also the global object:
console.log(this === window); // true
a = 37;
console.log(window.a); // 37
this.b = "MDN";
console.log(window.b) // "MDN"
console.log(b) // "MDN"js this in object
var wF = {
w : 560,
h : function() { return (312 - 42) / (560 / this.w) + 42; }
};
alert(wF.h())javascript this = that
var colours = ['red', 'green', 'blue'];
document.getElementById('element').addEventListener('click', function() {
// this is a reference to the element clicked on
var that = this;
colours.forEach(function() {
// this is undefined
// that is a reference to the element clicked on
});
});this keyword in javascript
"use strict";
function myFunction() {
return this;
}this javascript
// Im Webbrowser ist das window Objekt das globale Objekt:
console.log(this === window); // true
a = 37;
console.log(window.a); // 37
this.b = "MDN";
console.log(window.b); // "MDN"
console.log(b); // "MDN"Copyright © 2021 Codeinu
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