60 lines
1.5 KiB
Markdown
60 lines
1.5 KiB
Markdown
---
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title: "「JavaScript」修改 input type=\"file\" 元素的文件对象"
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date: 2025-03-15T22:42:40Z
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lastmod: 2025-03-15T22:43:04Z
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tags: [Web 前端,HTML5,JavaScript,代码片段]
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---
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# 「JavaScript」修改 input type="file" 元素的文件对象
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## 参考信息
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- [Stack Overflow - Is it possible to replace a file input with a Blob](https://stackoverflow.com/questions/21892890/is-it-possible-to-replace-a-file-input-with-a-blob)
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## 示例代码
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```javascript
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let fileItem = new File([blob], "example.txt", {
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type: "txet/plain",
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lastModified: Date.now(),
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});
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let container = new DataTransfer();
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container.items.add(fileItem);
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fileInputElement.files = container.files;
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```
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## 应用场景
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通过 `form` 提交自定义的文件：
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```javascript
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let container = new DataTransfer();
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let file = new File([blob], 'tp_tmp.zip');
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let frame = document.createElement('iframe');
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let form = document.createElement('form');
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let input = document.createElement('input');
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container.items.add(file);
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frame.setAttribute('name', 'form-result');
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form.setAttribute('action', `http://${localDeviceIP}:10808/ProcessServer/FileOperate/fileUpServlet`);
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form.setAttribute('enctype', 'multipart/form-data');
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form.setAttribute('method', 'post');
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form.setAttribute('target', 'form-result');
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form.appendChild(input);
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input.setAttribute('name', 'file');
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input.setAttribute('type', 'file');
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input.files = container.files;
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document.body.appendChild(frame);
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document.body.appendChild(form);
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form.submit();
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```
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