「JavaScript」- 操作 HTML 文档

var href = aTag.href
var value = input.value

//get the target div you want to append/prepend to
var someDiv = document.getElementById("targetDiv");

//append text
someDiv.innerHTML += "Add this text to the end";

//prepend text
someDiv.innerHTML = "Add this text to the beginning" + someDiv.innerHTML;

// after
someDiv.outerHTML += "Add this text to the end";

// before
someDiv.outerHTML = "Add this text to the end" + someDiv.outerHTML;

<div class="container">
  <div class="inner">Hello</div>
</div>

$( ".inner" ).prepend( "<p>Test</p>" );

<div class="container">
  <div class="inner">
    <p>Test</p>
    Hello
  </div>
</div>