1通过单引号双引号拼接
<script type="text/javascript">var test='测试id';var testHtml="<span id='"+test+"'>这是用来测试的html片段</span>"$('.container').html(testHtml)</script>
2.通过转义字符拼接
<script type="text/javascript">var test='测试id';var testHtml="<span id=\""+test+"\">这是用来测试的html片段</span>"$('.container').html(testHtml)</script>