文档对象模型（DOM）

event[p]); } document.body.appendChild(table);}showEventProperties(event); ， "值"]; const len = labelList.length; for (let i = 0; i len; i++) {addCell(row， text) {const cell = row.insertCell(-1);cell.appendChild(document.createTextNode(text)); } const event = e || window.event; document.getElementById("eventType").textContent = event.type; const table = document.createElement("table"); const thead = table.createTHead(); let row = thead.insertRow(-1); const labelList = ["#"， row.rowIndex);addCell(row， labelList[i]); } const tbody = document.createElement("tbody"); table.appendChild(tbody); for (const p in event) {row = tbody.insertRow(-1);row.className = row.rowIndex % 2 ? "odd" : "even";addCell(row， p);addCell(row， "属性"， js function showEventProperties(e) { function addCell(row，。