console 命令行工具 X clear

console

s1.addEventListener("click", function(e) {
  console.log("s1 冒泡事件");
},
false);
s2.addEventListener("click", function(e) {
  console.log("s2 捕获事件");
},
true);
s2.addEventListener("click", function(e) {
  console.log("s2 冒泡事件");
},
false);
s1.addEventListener("click", function(e) {
  console.log("s1 捕获事件");
},
true);

<div id="s1">
  s1
  <div id="s2">
    s2
  </div>
</div>