javascript HTML5 文件 API：FileReader.readAsText() 返回“未定义”

HTML5 File API: FileReader.readAsText() returns "undefined"

提问by Claudio Albertin

I use Chrome 12 on Mac OS X and I've included jQuery 1.6.1 within the document.

我在 Mac OS X 上使用 Chrome 12，并且在文档中包含了 jQuery 1.6.1。

I try to read the contents of a file as text and save it in a data-object with the following function:

我尝试将文件的内容作为文本读取并将其保存在具有以下功能的数据对象中：

this.upload = function(file) {
    console.log('FileHandler.upload called with ' + file.name + '.');
    console.log(file);
    console.log(this.reader);

    data = {
        content: this.reader.readAsText(file)
    }

    console.log('Content: ' + data.content);
}

"file" seams to be a valid file-object and "this.reader" is a fresh instance of type FileReader. This code creates the following console output:

“file”接缝是一个有效的文件对象，而“this.reader”是一个 FileReader 类型的新实例。此代码创建以下控制台输出：

http://cl.ly/1Y2b383G2F272x1m1P0N

http://cl.ly/1Y2b383G2F272x1m1P0N

采纳答案by pimvdb

That's not the way it works according to the docs. You should call the readAsText()function, and when it's completed the result is stored in .result.

根据文档，这不是它的工作方式。您应该调用该readAsText()函数，并在完成后将结果存储在.result.