FileUpload 上传下载文件兼容IE8

项目上使用FileUpload 上传附件，样式比较简单，功能也比较简单。简单的封装了一下javascript function AttachComponent(field, instanceId, value) { this.field = field; this.fieldName = this.field.name; this.fieldId = "id-" + Math.random(

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