varmdflag;varcount=0;document.addEventListener("mousedown",mdown,false);document.addEventListener("mouseup",mup,false);}functionmdown(){mdflag=true;while(mdflag)document.getElementById("testdiv").innerHTML=count++;}functionmup(){mdflag=false;}我想在鼠标按下时运行代码，我找不到任何建议我可以做while(mousedown)所以我尝试为moused