如何在发送到服务器之前在 javascript 中压缩/gzip 用户数据？
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How to zip/gzip user data in javascript before sending to the server?
提问by Jér?me Verstrynge
I am still new to Javascript. I have a situation where many users can send large JSON back to the server. In order to limit traffic, I would like to gzip them. Is this possible in Javascript? How can I can create a byte array from the string representation of the JSON? Thanks.
我还是 Javascript 的新手。我有一种情况，许多用户可以将大型 JSON 发送回服务器。为了限制流量，我想对它们进行gzip。这在 Javascript 中可能吗？如何从 JSON 的字符串表示创建字节数组？谢谢。
回答by Jason T Featheringham
I know of no gzip implementations, but there are other compression methods at your disposal.
我知道没有 gzip 实现，但是您可以使用其他压缩方法。
This will lzw-encode a string using JavaScript:
这将使用 JavaScript 对字符串进行 lzw 编码：
// lzw-encode a string
function lzw_encode(s) {
var dict = {};
var data = (s + "").split("");
var out = [];
var currChar;
var phrase = data[0];
var code = 256;
for (var i=1; i<data.length; i++) {
currChar=data[i];
if (dict[phrase + currChar] != null) {
phrase += currChar;
}
else {
out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
dict[phrase + currChar] = code;
code++;
phrase=currChar;
}
}
out.push(phrase.length > 1 ? dict[phrase] : phrase.charCodeAt(0));
for (var i=0; i<out.length; i++) {
out[i] = String.fromCharCode(out[i]);
}
return out.join("");
}
回答by Tom
I believe so, here's a wikipedia article on the subject http://en.wikipedia.org/wiki/HTTP_compression
我相信是这样，这里有一篇关于这个主题的维基百科文章http://en.wikipedia.org/wiki/HTTP_compression
