Created
September 23, 2016 07:04
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How to function this keyword in Javascript
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| /* | |
| - Implicit Binding | |
| - Explicit Binding | |
| - new Binding | |
| - window Binding | |
| */ | |
| // Implicit Binding | |
| // Left of the Dot at Call Time | |
| var Person = function (name, age) { | |
| return { | |
| name: name, | |
| age: age, | |
| sayName: function () { | |
| console.log(this.name) | |
| }, | |
| mother: { | |
| name: 'Stacey', | |
| sayName: function () { | |
| console.log(this.name) | |
| } | |
| } | |
| } | |
| } | |
| var jim = Person('Jim', 42) | |
| jim.sayName() | |
| jim.mother.sayName() | |
| // Explicit Binding | |
| // call, apply, bind | |
| var sayName = function (lang1, lang2, lang3) { | |
| console.log('My name is ' + this.name + ' and I know ' + lang1 + ', ' + lang2 + ', and ' + lang3) | |
| } | |
| var stacey = { | |
| name: 'Stacey', | |
| age: 34 | |
| } | |
| var languages = ['JavaScript', 'Ruby', 'Python'] | |
| sayName.call(stacey, languages[0], languages[1], languages[2]) | |
| sayName.apply(stacey, languages) | |
| var newSayName = sayName.bind(stacey, languages[0], languages[1], languages[2]) | |
| newSayName() | |
| // new Binding | |
| var Animal = function (color, name, type) { | |
| this.color = color; | |
| this.name = name; | |
| this.type = type; | |
| } | |
| var zebra = new Animal('black and white', 'Zorro', 'Zebra') | |
| console.log(zebra) | |
| // windod Binding | |
| var sayAge = function () { | |
| console.log(this.age) | |
| } | |
| sayAge() | |
| window.age = 30 | |
| sayAge() |
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