TextDecoder 的 Polyfill
Polyfill for TextDecoder
我在我的应用程序中使用 fetch
and have included the whatwg-fetch
polyfill。
我也使用 TextDecoder
as described in Jake Archibald's blog That's so fetch! 来解码响应,但我不确定要使用什么 polyfill。
(目前 Safari 抱怨 ReferenceError: Can't find variable: TextDecoder
)
我猜 TextDecoder
有一个 polyfill,但我没有找到它...
我使用 text-encoding
库解决了这个问题
npm install text-encoding --save
连同
import encoding from 'text-encoding';
const decoder = new encoding.TextDecoder();
对于快速客户端测试(没有 NPM):
<script src="https://unpkg.com/text-encoding@0.6.4/lib/encoding-indexes.js"></script>
<script src="https://unpkg.com/text-encoding@0.6.4/lib/encoding.js"></script>
..然后像往常一样使用 TextDecoder
。 MDN's example:
var win1251decoder = new TextDecoder('windows-1251');
var bytes = new Uint8Array([207, 240, 232, 226, 229, 242, 44, 32, 236, 232, 240, 33]);
console.log(win1251decoder.decode(bytes)); // Привет, мир!
<script src="https://unpkg.com/text-encoding@0.6.4/lib/encoding-indexes.js"></script>
<script src="https://unpkg.com/text-encoding@0.6.4/lib/encoding.js"></script>
现在您可以使用 FastestSmallestTextEncoderDecoder polyfill (1.5 KB), as recommended by the MDN website。
如果您只想将数组解码为 utf8,只需添加一个函数,无需外部库:
function Utf8ArrayToStr(array) {
var out, i, len, c;
var char2, char3;
out = "";
len = array.length;
i = 0;
while(i < len) {
c = array[i++];
switch(c >> 4)
{
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
// 0xxxxxxx
out += String.fromCharCode(c);
break;
case 12: case 13:
// 110x xxxx 10xx xxxx
char2 = array[i++];
out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = array[i++];
char3 = array[i++];
out += String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
}
}
return out;
}
我在我的应用程序中使用 fetch
and have included the whatwg-fetch
polyfill。
我也使用 TextDecoder
as described in Jake Archibald's blog That's so fetch! 来解码响应,但我不确定要使用什么 polyfill。
(目前 Safari 抱怨 ReferenceError: Can't find variable: TextDecoder
)
我猜 TextDecoder
有一个 polyfill,但我没有找到它...
我使用 text-encoding
库解决了这个问题
npm install text-encoding --save
连同
import encoding from 'text-encoding';
const decoder = new encoding.TextDecoder();
对于快速客户端测试(没有 NPM):
<script src="https://unpkg.com/text-encoding@0.6.4/lib/encoding-indexes.js"></script>
<script src="https://unpkg.com/text-encoding@0.6.4/lib/encoding.js"></script>
..然后像往常一样使用 TextDecoder
。 MDN's example:
var win1251decoder = new TextDecoder('windows-1251');
var bytes = new Uint8Array([207, 240, 232, 226, 229, 242, 44, 32, 236, 232, 240, 33]);
console.log(win1251decoder.decode(bytes)); // Привет, мир!
<script src="https://unpkg.com/text-encoding@0.6.4/lib/encoding-indexes.js"></script>
<script src="https://unpkg.com/text-encoding@0.6.4/lib/encoding.js"></script>
现在您可以使用 FastestSmallestTextEncoderDecoder polyfill (1.5 KB), as recommended by the MDN website。
如果您只想将数组解码为 utf8,只需添加一个函数,无需外部库:
function Utf8ArrayToStr(array) {
var out, i, len, c;
var char2, char3;
out = "";
len = array.length;
i = 0;
while(i < len) {
c = array[i++];
switch(c >> 4)
{
case 0: case 1: case 2: case 3: case 4: case 5: case 6: case 7:
// 0xxxxxxx
out += String.fromCharCode(c);
break;
case 12: case 13:
// 110x xxxx 10xx xxxx
char2 = array[i++];
out += String.fromCharCode(((c & 0x1F) << 6) | (char2 & 0x3F));
break;
case 14:
// 1110 xxxx 10xx xxxx 10xx xxxx
char2 = array[i++];
char3 = array[i++];
out += String.fromCharCode(((c & 0x0F) << 12) |
((char2 & 0x3F) << 6) |
((char3 & 0x3F) << 0));
break;
}
}
return out;
}