给html标签加上鼠标划过小手样式
方法：给当前标签增加样式style="cursor:pointer;"
eg：增加返回箭头样式，给箭头增加小手<span onclick="go_back()" class="glyphicon glyphicon-chevron-left" style="cursor:pointer;padding-right:5px;"></span>
方法：给当前标签增加样式style="cursor:pointer;"
eg：增加返回箭头样式，给箭头增加小手<span onclick="go_back()" class="glyphicon glyphicon-chevron-left" style="cursor:pointer;padding-right:5px;"></span>