我在删除使用 javascript 添加的段落时遇到问题。添加按钮效果很好。当我尝试删除该段落时出现问题。function rdn_id(){return Math.random().toString(36).substring(7);}//create buttonfunction create_btn(){   //Create a remove button   var btn_remove = document.createElement("BUTTON");   //create a unique button ID   id_btn_remove = rdn_id();   btn_remove.id = id_btn_remove ;    btn_remove.textContent = "Remove file";   return [btn_remove, id_btn_remove];}//add elt functionfunction create_p_btn(){   //Create paragraph   var paragraph = document.createElement("P");   //create a unique p ID   id_paragraph = rdn_id();   paragraph.id = id_paragraph;   paragraph.style.paddingTop = "5px";   paragraph.style.background = "blue";   document.getElementById("setItHere").appendChild(paragraph);   // add button   var values = create_btn();   var btn_rmv = values[0];   var id_btn = values[1];   paragraph.appendChild(btn_rmv);   document.getElementById(id_btn).addEventListener("onclick", function(){remove_func(id_paragraph);}); }//Remove functionfunction remove_func(id_el){    var elt = document.getElementById(id_el);    elt.parentNode.removeChild(id_el);}<div id="setItHere"><Button id="start" onclick="create_p_btn();">add</Button></div>