<img alt="" src={Url}  onMouseDown={handleMouseDown}  onMouseMove={handleMouseMove}  onMouseUp={handleMouseUp}/>事件  let flag = false  const handleMouseDown = () => {    flag = true    console.log('down')  }  const handleMouseMove = () => {    if (flag) {      console.log('move')    }  }  const handleMouseUp = () => {    console.log('up')    flag = false  }想要實現從圖片中選取一個區域，當按下鼠標時可以監聽到，按著移動和松開都監聽不到。在原地按下松開可以監聽到。請大家幫忙看看