嗨我想知道我是否以正确的方式执行此操作,我希望有一个Typescript变量来保持对HTML5 Canvas的Jquery引用。我有一个无类型的canvas对象,它从$(document).ready中的行传递给构造函数。
game.ts:
///<reference path="../javascripts/sprite.js" />
///<reference path="d.ts/jquery-1.8.d.ts" />
///<reference path="../javascripts/jquery-1.8.2.js/>
$(document).ready(function () {
canvas = $('#canvas');
})
});
class Game {
canvas;
CANVAS_WIDTH: number;
CANVAS_HEIGHT: number;
constructor (canvas) {
this.canvas = canvas;
this.CANVAS_WIDTH = canvas.width();
this.CANVAS_HEIGHT = canvas.height();
}
但是在游戏类中使用这个canvas变量时,我没有像.width()那样得到任何jquery语法自动完成;
答案 0 :(得分:4)
解决方案,使用JQuery变量:
class Game {
canvas : JQuery;
CANVAS_WIDTH: number;
CANVAS_HEIGHT: number;
constructor (canvas:JQuery) {
this.canvas = canvas;
this.CANVAS_WIDTH = canvas.width();
this.CANVAS_HEIGHT = canvas.height();
}
答案 1 :(得分:4)
更好的方法(使用HTMLCanvasElement类型),虽然丢失width()属性是指像这样引用Canvas。
canvas: HTMLCanvasElement = <HTMLCanvasElement> document.getElementById('canvas');
context2D: CanvasRenderingContext2D;