JS隐藏上传文本框，单按钮上传

function openBrowse() {
document.getElementById("file").value = null;
var ie = navigator.appName == "Microsoft Internet Explorer" ? true : false;
//console.log(navigator.appName);return;
if (ie) {
document.getElementById("file").click();
document.getElementById("fileName").innerText = document.getElementById("file").value;
return;
} else {
var a = document.createEvent("MouseEvents");
a.initEvent("click", true, true);
document.getElementById("file").dispatchEvent(a);
}

setInterval(function () {
var newFileName = document.getElementById("file").value;
if (newFileName != null && newFileName != "") {
if (newFileName != fileName) {
fileName = document.getElementById("file").value;
$('#form').submit(); //提交表单
}
}
}, 1000);//每1秒调用一次
}