js-原生js触发器使用

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>RunJS</title>
<script src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<script type="text/javascript" >
$(function(){
    $("#open").click(function(){
    // $("#upload").trigger("click");
        var myEvent = new Event('click');
        var e = document.createEvent("MouseEvents");
        e.initEvent("click", true, true);　　　　　　　　　　　　　　//这里的click可以换成你想触发的行为
        document.getElementById('upload').dispatchEvent(e);
    });
});
</script>
</head>
<body>
<button id="open">Hello RunJS!</button>
<input type="file" id="upload" style="display:none;">
</body>
</html>

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