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我有事件在画布上onMouseDown
-问题在reactjs与event.which - 未定义
<canvas id="myCanvas" width="150" height="150" onMouseMove={this.beginNewPatch.bind(this)}></canvas>
但是,当我在上面画布上移动,我想,如果在鼠标左键点击与e.which
到现在得到的,但这打印undefined
。任何提示为什么?
beginNewPatch(e){
console.log(e.which);
if (e.which === 1) {
let dot, eventDoc, doc, body, pageX, pageY;
e = e || window.event;
}
}