【js笔记】点击按钮后文本可编辑

<button id="edit">编辑</button>
     <p id="email">[e-mail]</p>
     <script>
         document.getElementById("edit").onclick = function() {
             var text = document.getElementById("email");
             var val = text.innerHTML;
             text.innerHTML = "<input type='text' id='n' value=" + val + " />";
             document.getElementById("n").addEventListener("blur", function(e) {
                  ext.innerHTML = document.getElementById("n").value;
             });
         };
</script>