无刷新文件上传，刷新文件上传
无刷新文件上传，刷新文件上传
无刷新文件上传
ajax的FormData对象完成无刷新操作
ajax level 2 标准 可以对文件操作，但是只支持新的浏览器（不兼容低版本的IE），是H5标准
注意事项：
b) css设置
c) 设置监控文件上传事件
iframe实现无刷新上传
技术点1： 需要设置表单提交打开的窗口为 自己定义的一个 iframe
技术点2： 在data.php 文件需要处理生成的图片，然后返回图片URL地址，使用top获取打开当前iframe的窗口，修改img标签的src属性
2. data.php 完成图片的保存和返回
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