您可以replace 所有程式，不使用命名实体：

You can just replace everything programmatically, not using named entities:

return input.replace(/[^ -~]/g, function(chr) {
//                    ^^^^^^ 
// this is a regexp for "everything than printable ASCII-characters"
// and even works in a ASCII-only charset. Identic: [^\u0020-\u007E]
    return "&#"+chr.charCodeAt(0)+";";
});

如果要使用命名实体，可以将其与键值映射像@jackwanders的答案）：

If you want to use named entities, you can combine this with a key-value-map (as like in @jackwanders answer):

var chars = {
    "á" : "á",
    "Á" : "Á",
    "é" : "é",
    "É" : "É",
    ...
}
return input.replace(/[^ -~]/g, function(chr) {
    return (chr in chars) 
      ? chars[chr]
      : "&#"+chr.charCodeAt(0)+";";
});

但是，您永远不需要使用html实体在JavaScript中。使用UTF8作为一切的字符编码，它将工作。

However, you should never need to use html entities in JavaScript. Use UTF8 as the character encoding for everything, and it will work.