如何使用 JavaScript/jQuery 从 HTML 中获取符号的 unicode/hex 表示？
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How do I get the unicode/hex representation of a symbol out of the HTML using JavaScript/jQuery?
提问by Hristo
Say I have an element like this...
说我有一个这样的元素......
<math xmlns="http://www.w3.org/1998/Math/MathML">
<mo class="symbol">α</mo>
</math>
Is there a way to get the unicode/hex value of alpha α, α, using JavaScript/jQuery? Something like...
有没有办法使用 JavaScript/jQuery获取 alpha α,的 unicode/hex 值α？就像是...
$('.symbol').text().unicode(); // I know unicode() doesn't exist
$('.symbol').text().hex(); // I know hex() doesn't exist
I need αinstead of αand it seems like anytime I insert αinto the DOM and try to retrieve it right away, it gets rendered and I can't get �k; I just get α.
我需要α而不是，α而且似乎每当我插入㬝OM 并尝试立即检索它时，它都会被渲染而我无法α返回；我只得到α。
回答by aroth
Using mostly plain JavaScript, you should be able to do:
主要使用纯 JavaScript，您应该能够做到：
function entityForSymbolInContainer(selector) {
var code = $(selector).text().charCodeAt(0);
var codeHex = code.toString(16).toUpperCase();
while (codeHex.length < 4) {
codeHex = "0" + codeHex;
}
return "&#x" + codeHex + ";";
}
Here's an example: http://jsfiddle.net/btWur/
这是一个例子：http: //jsfiddle.net/btWur/
回答by Jim Deville
charCodeAtwill get you the decimal value of the string:
charCodeAt将为您提供字符串的十进制值：
"α".charCodeAt(0); //returns 945
0x03b1 === 945; //returns true
toStringwill then get the hex string
toString然后将获得十六进制字符串
(945).toString(16); // returns "3b1"
(Confirmed to work in IE9 and Chrome)
（已确认在 IE9 和 Chrome 中工作）
回答by Matas Vaitkevicius
If you would try to convert Unicode character out of BMP (basic multilingual plane)in ways above - you are up for a nasty surprise. Characters out of BMP are encoded as multiple UTF16values for example:
如果您尝试以上述方式将 Unicode 字符从BMP（基本多语言平面）中转换出来，那么您会遇到令人讨厌的惊喜。BMP 之外的字符被编码为多个UTF16值，例如：
"".length= 2 (one part for shackle one part for lock base :) )
"".length= 2（一部分用于卸扣，一部分用于锁座:)）
so "".charCodeAt(0)will give you 55357which is only 'half' of number while "".charCodeAt(1)will give you 56594which is the other half.
所以"".charCodeAt(0)会给你55357只有“一半”的数字，而"".charCodeAt(1)会给你56594另一半。
To get char codes for those values you might wanna use use following string extension function
要获取这些值的字符代码，您可能需要使用以下字符串扩展函数
String.prototype.charCodeUTF32 = function(){
return ((((this.charCodeAt(0)-0xD800)*0x400) + (this.charCodeAt(1)-0xDC00) + 0x10000));
};
you can also use it like this
你也可以这样使用
"&#x"+("".charCodeUTF32()).toString(16)+";"
to get html hex codes.
获取 html 十六进制代码。
Hope this saves you some time.
希望这可以为您节省一些时间。
回答by chings228
for example in case you need to convert this hex code to unicode
例如，如果您需要将此十六进制代码转换为 unicode
e68891e4bda0e4bb96
e68891e4bda0e4bb96
- pick two character time by time ,
- if the dec ascii code is over 127 , add a % before
return url decode string
function hex2a(hex) { var str = ''; for (var i = 0; i < hex.length; i += 2){
var dec = parseInt(hex.substr(i, 2), 16); character = String.fromCharCode(dec); if (dec > 127) character = "%"+hex.substr(i,2); str += character; } return decodeURI(str);}
- 一次次选择两个字符，
- 如果 dec ascii 代码超过 127 ，则在前面添加 %
返回 url 解码字符串
函数 hex2a(hex) { var str = ''; for (var i = 0; i < hex.length; i += 2){
var dec = parseInt(hex.substr(i, 2), 16); character = String.fromCharCode(dec); if (dec > 127) character = "%"+hex.substr(i,2); str += character; } return decodeURI(str);}
