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从这个博客http://blog.mozilla.org/nfroyd/2012/01/26/compressing-strings-in-js/看来应该是可能的，但我在实施时遇到了麻烦（基本上是这样）。

我的代码是

function Accumulator() {
    this.buffer = "";
};

Accumulator.prototype = {
    buffer: null,
    onStartRequest: function(request, context) {},
    onStopRequest: function(request, context, statusCode) {},
    onDataAvailable: function(request, context, inputStream, offset, count) {
        var stream = Components.classes["@mozilla.org/binaryinputstream;1"].createInstance(Components.interfaces.nsIBinaryInputStream);
        stream.setInputStream(inputStream);
        var input = stream.readByteArray(count);
        this.buffer += String.fromCharCode.apply(input);
    }
};

function compress(string) {
    var accumulator = new Accumulator();
    var converter = Components.classes["@mozilla.org/streamconv;1?from=uncompressed&to=gzip"].createInstance(Components.interfaces.nsIStreamConverter);
    // More respecifying input/output types.
    converter.asyncConvertData("uncompressed", "gzip", accumulator, null);
    // Oh, that method doesn't actually convert anything, it just prepares
    // the instance for doing conversion.
    var stream = Components.classes["@mozilla.org/io/string-input-stream;1"].createInstance(Components.interfaces.nsIStringInputStream);
    stream.data = string;
    converter.onStartRequest(null, null);
    converter.onDataAvailable(null, null, stream, 0, string.length);
    converter.onStopRequest(null, null, 201 /* 417 */);
    return accumulator.buffer;
};

但是当我使用它时，我收到一个错误，即 converter.onRequestStart 不是函数。

想知道我是否在做明显错误的事情？

编辑：

1）修正一些明显的错误。Ci 原来我没看懂，是 Components.interfaces。

2）原始代码似乎有onRequestStart/Stop倒退，它们应该是onStartRequest/onStopRequest。

通过这些更改，不再引发任何错误，而且还返回一个空字符串，因此似乎没有发生任何事情。:(

4

1 回答 1

1

认为我已经修复了它（似乎适用于我的基本测试，包括像 espn 这样的大型网站）

function Accumulator() {
    this.buffer = "";
};

Accumulator.prototype = {
    buffer: null,
    onStartRequest: function(request, context) {},
    onStopRequest: function(request, context, statusCode) {},
    onDataAvailable: function(request, context, inputStream, offset, count) {
        var stream = Components.classes["@mozilla.org/binaryinputstream;1"].createInstance(Components.interfaces.nsIBinaryInputStream);
        stream.setInputStream(inputStream);
        var input = stream.readByteArray(count);

        this.buffer += String.fromCharCode.apply(null, input);
    }
};

function compress(string) {
    var accumulator = new Accumulator();
    var converter = Components.classes["@mozilla.org/streamconv;1?from=uncompressed&to=gzip"].createInstance(Components.interfaces.nsIStreamConverter);
    // More respecifying input/output types.
    converter.asyncConvertData("uncompressed", "gzip", accumulator, null);
    // Oh, that method doesn't actually convert anything, it just prepares
    // the instance for doing conversion.
    var stream = Components.classes["@mozilla.org/io/string-input-stream;1"].createInstance(Components.interfaces.nsIStringInputStream);
    stream.data = string;
    converter.onStartRequest(null, null);
    converter.onDataAvailable(null, null, stream, 0, string.length);
    converter.onStopRequest(null, null, 201 /* 417 */);
    return accumulator.buffer;
};
于 2012-08-19T03:59:51.690 回答