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标题:原生js FileUpload 的文件上传 JS控件可支持IE、chrome、firefox等主流浏览器
正文:
代码如下:
(function() {
if (window.FileUpload) {
return;
}
window.FileUpload = function (id, url) {
this.id = id;
this.autoUpload = true;
this.url = url;
this.maxSize = null;
this.extensions = null;
this.dropId = null;
};

window.FileUpload.prototype.init = function() {
var obj = this;
$('#' + this.id).change(function () {
if (obj.autoUpload) {
obj.upload();
}
});
if (this.supportsFormData()) {
if (this.dropId != null) {
var drop = $('#' + this.dropId)[0];
drop.addEventListener("dragover", function(e) {
e.stopPropagation();
e.preventDefault();
$('#' + obj.dropId).addClass("dragover");
}, false);
drop.addEventListener("dragout", function(e) {
$('#' + obj.dropId).removeClass("dragover");
}, false);
drop.addEventListener("drop", function(e) {
e.stopPropagation();
e.preventDefault();
$('#' + obj.dropId).removeClass("dragove
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