未捕获的语法错误：意外的令牌= [英] Uncaught SyntaxError: Unexpected token =
问题描述
我刚刚从使用d3.v3的缩小版本的本地副本切换到开发版本。在使用缩小版本，但使用我的本地副本 http://d3js.org/d3.v3.js给出标题中的错误，引用此行：
I just switched from using a local copy of the minified version of d3.v3 to the development version. It worked fine when using the minified version, but using my local copy of http://d3js.org/d3.v3.js gives me the error in the title, referencing this line:
var € = Math.PI, µ = 1e-6, d3_radians = € / 180, d3_degrees = 180 / €;
当我包含托管文件时，它工作正常。
When I include the hosted file, it works fine.
推荐答案
问题是你使用ISO-8859-1字符编码（通常是浏览器默认） D3必须以UTF-8编码提供。通常情况下，这是因为您在加载HTML页面顶部缺少元标记：
The problem is that you are serving D3 with the ISO-8859-1 character encoding (often the browser default), whereas D3 must be served with UTF-8 encoding. Typically this happens because you are missing a meta tag at the top of the loading HTML page:
<!DOCTYPE html>
<meta charset="utf-8">
元指定的字符集是必需的，因为 d3js.org 由 GitHub Pages 提供，不指定字符集在Content-Type响应头中。因此，从加载HTML文档推断字符集。
The meta-specified charset is required because d3js.org is served by GitHub Pages and does not specify a charset in the Content-Type response header. The charset is therefore inferred from the loading HTML document.
如果愿意，您可以在脚本标记上指定一个charset属性。确保在测试之前清除浏览器缓存，因为缓存副本将从最初访问时保留字符编码：
If you prefer, you can specify a charset attribute on the script tag. Make sure you clear your browser cache before testing, as the cached copy will retain the character encoding from when it was originally accessed:
<script src="http://d3js.org/d3.v3.js" charset="utf-8"></script>
缩小版本不会发生错误，因为变量名称由ASCII等效项替换。 （我不记得，如果格式字符串中的UTF-8字符同样被转义序列替换，但我仍然建议在所有情况下将D3作为UTF-8）。
The error does not occur with the minified version because the variable names are replaced with ASCII equivalents. (I don't recall offhand if UTF-8 characters in format strings are likewise replaced with escape sequences, but I still recommend serving D3 as UTF-8 in all cases.)
如果您通过在浏览器中查看源代码然后使用复制粘贴来下载D3，这也是为什么我建议您下载 d3.v3.zip 。
Encoding problems can also happen if you downloaded D3 by viewing the source in your browser and then using copy-paste, which is why I recommend downloading d3.v3.zip.
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