如何点击a标签实现弹出input file上传文件对话框

<SPAN class=tag><<SPAN class=title>div</SPAN>></SPAN> 
<SPAN class=tag><<SPAN class=title>a</SPAN> <SPAN class=attribute>href</SPAN>=<SPAN class=value>"###"</SPAN>></SPAN>添加图片<SPAN class=tag></<SPAN class=title>a</SPAN>></SPAN> 
<SPAN class=tag><<SPAN class=title>input</SPAN> <SPAN class=attribute>type</SPAN>=<SPAN class=value>"file"</SPAN> <SPAN class=attribute>name</SPAN>=<SPAN class=value>"image"</SPAN> <SPAN class=attribute>class</SPAN>=<SPAN class=value>"hidden"</SPAN> <SPAN class=attribute>value</SPAN>=<SPAN class=value>""</SPAN> /></SPAN> 
<SPAN class=tag></<SPAN class=title>div</SPAN>></SPAN>

<SPAN class=class>.hidden</SPAN> <SPAN class=rules>{ 
<SPAN class=rule><SPAN class=attribute>display</SPAN>:<SPAN class=value> none;</SPAN></SPAN> 
<SPAN class=rule>}</SPAN></SPAN>

jquery 
$('a').on('click', function(e) { 
e.preventDefault(); 
$(this).closest('input[type=file]').trigger('click'); 
})