我可能missunderstood了一些概念,但在阅读4个主题上的stackoverflow和“私人成员在打字稿”的文档 - 我仍然困惑。打字稿私人方法“不是一个功能”
我正在写简单的鼠标IO(第一个打字稿项目)。这是发生故障的鼠标类的全码:
class Mouse {
public left: MouseKeyData = new MouseKeyData();
public right: MouseKeyData = new MouseKeyData();
public whell: MouseKeyData = new MouseKeyData();
public x: number = 0;
public y: number = 0;
private crossBrowserButton(e: any):string {
switch (e.button) {
case 0: return 'left';
case 1: return 'whell';
case 2: return 'right';
case 3: return 'back';
case 4: return 'forward';
}
return 'none';
}
private onMouseDown(e: any):void {
let target: MouseKeyData = this.left;
try {console.log(this.crossBrowserButton(e))} catch (a) {console.warn(a)} finally {}
if(target) {
target.press();
}
}
private onMouseUp(e: any):void {
let target: MouseKeyData = this.left;
if(target) {
target.release();
}
}
private onMouseMove(e: any): void {
this.x = e.pageX;
this.y = e.pageY;
}
public constructor() {
let anchor = document.body;
anchor.addEventListener('mousedown', this.onMouseDown);
anchor.addEventListener('mouseup', this.onMouseUp);
anchor.addEventListener('mousemove', this.onMouseMove);
}
}
我习惯叫this.crossBrowserButton(e)
内onMouseDown
和onMouseUp
,但我只this.crossBrowserButton is not a function(…)
了。
我觉得我失去了this
范围一些在这里,但this.left
完美的作品。
在此先感谢!
我正在投票结束这个问题,因为这个错误在低技术水平的世界很常见,我想通了什么是错的。 –