console 命令行工具 X clear

console

var list = document.getElementById("list");

for (let i = 1; i <= 5; i++) {
  var item = document.createElement("LI");
  item.appendChild(document.createTextNode("Item " + i));

  let j = i;
  item.onclick = function (e) {
    console.log("Item " + i + " is clicked.");
  };
  list.appendChild(item);
}

<input type="button" onclick="varTest()" name="" id="" value="1" />

<input type="button" onclick="letTest()" name="" id="" value="2"/>

<div id="list"></div>