jquery binding future event mousedown invalid

      setInterval(() => {
    
    
      	// 以下代码有效
        $("g[class^='dialNumber'] rect").off("mousedown");
        $("g[class^='dialNumber'] rect").on("mousedown",function(){
    
    
          console.log(1)
        });
		
		// 以下代码失效
        $(document).on("mousedown","g[class^='dialNumber'] rect",function(){
    
    
          console.log("mousedown");
        });
        console.log("1s");
      }, 1000);

solution

循环访问DOM直至查询到DOM
let mousedownTimer = setInterval(() => {
    
    
	// DOM存在 清除定时器
	if($("g[class^='dialNumber'] rect").length >0){
    
    
		clearInterval(mousedownTimer);
		// 以下为mousedomn绑定事件
        $("g[class^='dialNumber'] rect").off("mousedown");
        $("g[class^='dialNumber'] rect").on("mousedown",function(){
    
    
          console.log(1)
        });
	}
}, 1000);