在javascript中替换字符串中的多个字符

问题描述：

我有这个漂亮的代码，我不知道为什么不工作。它应该获得文本输入的值，并将每个给定的国家字符替换为其HTML代码，以实现兼容性。但是，当我单击按钮，该函数返回字符串没有任何更改。
任何想法？

I got this nice code, which I have no idea why doesn't work. It should get the value of a text input and replace each given national character with it's HTML code, for compatibility purposes. But, when I click the button, the function returns the string without any changes. Any idea?

（ jsfiddle ）

<a id="reminder1" onclick="document.getElementById('reminder2').style.display = ''; document.getElementById('reminder1').style.display = 'none';">
    Set reminder
</a>
<a id="reminder2" class="reminder" style="display:none;">
    <input type="text" id="reminderh" size=40 style="font-size:20px;">
    <input type="button" value="Set" onclick="csere(document.getElementById('reminderh').value);">
</a>

<script>
function csere(qwe){
document.getElementById('reminder2').style.display = 'none';

var rtz0  = qwe.replace("á","&aacute;");
var rtz1  = rtz0.replace("Á","&Aacute;");

var rtz2  = rtz1.replace("é","&eacute;");
var rtz3  = rtz2.replace("É","&Eacute;");

var rtz4  = rtz3.replace("í","&iacute;");
var rtz5  = rtz4.replace("Í","&Iacute;");

var rtz6  = rtz5.replace("ö","&ouml;");
var rtz7  = rtz6.replace("Ö","&Ouml;");
var rtz8  = rtz7.replace("ő","&&#337;");
var rtz9  = rtz8.replace("Ő","&#336;");
var rtz10 = rtz9.replace("ó","&oacute;");
var rtz11 = rtz10.replace("Ó","&Oacute;");

var rtz12 = rtz11.replace("ü","&uuml;");
var rtz13 = rtz12.replace("Ü","&Uuml;");
var rtz14 = rtz13.replace("ű","&#369;");
var rtz15 = rtz14.replace("Ű","&#368;");
var rtz16 = rtz15.replace("ú","&uacute;");
var uio = rtz16.replace("Ú","&Uacute;");

//Creates a cookie with the final value (different function)
createCookie('reminder',uio,1500);

document.getElementById('reminder1').style.display = '';
}
</script>

答

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" : "&aacute;",
    "Á" : "&Aacute;",
    "é" : "&eacute;",
    "É" : "&Eacute;",
    ...
}
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.

在javascript中替换字符串中的多个字符

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