<script src="/js/jquery-1.11.1.min.js"></script>
$(document).ready(function(){
$("#btn1").click(function(){
$("img").before("<b>Before</b>");
$("#btn2").click(function(){
$("img").after("<i>After</i>");
<img src="/img/eg_W3xue.gif" alt="W3xue Logo" />
<button id="btn1">在图片前面添加文本</button>
<button id="btn2">在图片后面添加文本</button>