<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Demo</title>
<script type="text/javascript">
function F_Open_dialog()
{
document.getElementById("btn_file").click();
}
</script>
</head>
<body>
<div>
<input type="file" id="btn_file" style="display:none">
<img src="http://7u2nae.com1.z0.glb.clouddn.com/2.jpg" onclick="F_Open_dialog()">
</div>
</body>
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