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Richardcsts

Javascript - #PixiJs Error Undefined

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Hoje eu estava aprendendo a mexer com a biblioteca Pixi.js, e estava recriando um joguinho que vi na playstore, e eu recebi um undefined mas não entendi o porquê.

 

function Block(blockType_, x, y, id){
		this.id = 0;
		this.blockType = blockType_
		this.x = x
		this.y = y
		this.timeToBreak = new Date().getTime()-2000 //O undefined é desta variável
		this.hitpoints 	 = 50;
		
		this.sprite = new PIXI.Sprite(
			PIXI.loader.resources[this.blockType.url].texture
		)

		this.sprite.interactive = true;

		this.show = function(){
			if(this.hitpoints > 0){
				this.sprite.position.set(this.x, this.y)
				app.stage.addChild(this.sprite)
			}
		}

		this.sprite.on("mousedown", function(){
			console.log(this.timeToBreak) //Recebi o undefined ao printar no console do navegador
		})

Se alguém poder me ajudar e me explicar, fico imensamente agradecido!

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this.sprite.on("mousedown", () => {
	console.log(this.timeToBreak) 
})

this.sprite.on("mousedown", (function(){
	console.log(this.timeToBreak)
}).bind(this))

this.sprite.on("mousedown", function(){
	console.log(this.timeToBreak)
}, this)

Learn what means "bound function" in javascript.

 

Welcome to our forum!

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9 minutes ago, ivan.popelyshev said:

this.sprite.on("mousedown", () => {
	console.log(this.timeToBreak) 
})

this.sprite.on("mousedown", (function(){
	console.log(this.timeToBreak)
}).bind(this))

this.sprite.on("mousedown", function(){
	console.log(this.timeToBreak)
}, this)

Learn what means "bound function" in javascript.

 

Welcome to our forum!

Thank you so much!!! ❤️ i love this forum

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