任何人都可以帮忙吗？
以下代码只需点击一下按钮即可复制div中的文字。
现在我需要每次在复制文本的底部添加网站网址吗？
我正在帮助我的一位朋友，他问我这件事。我无法理解。 ：（
这是非常复杂的代码，不知道是谁创建了这个代码，但现在我需要对其进行一些更改。请帮帮我。
<!doctype html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta charset="UTF-8">
<title>Cheval</title>
</head>
<body>
<h2 style="margin-top: 8px; margin-bottom: 8px;">Java Script</h2>
<hr>
<textarea class="text-to-copy">JS is the future.</textarea>
<p>
<button class="js-copy-btn">Copy text</button>
</p>
<textarea rows="5" class="text-to-copy-0">Create as many elements as you want, and match them up by name.</textarea>
<p>
<button class="js-copy-btn-0">Copy text</button>
</p>
<textarea rows="5" class="text-to-copy-1">The button and elements do not need to be near each other.</textarea>
<p>
<button class="js-copy-btn-1">Copy text</button>
</p>
<textarea rows="5" class="foobar text-to-copy-3 bazzot">They can have as many other classes as you want.</textarea>
<p>
<button class="foobar js-copy-btn-3 bazzot">Copy text</button>
</p>
<input class="text-to-copy-input" value="Inputs work too!">
<p>
<button class="js-copy-btn-input">Copy text</button>
</p>
<div class="text-to-copy-2">You do not need to use a <code>textarea</code>, for example, this is a <code>div</code>!</div>
<p>
<button class="js-copy-btn-2">Copy text</button>
</p>
<div style="position: fixed; bottom: 5px; right: 5px;"><a href="https://github.com/ryanpcmcquen/cheval">source</a></div>
<script>
// @license magnet:?xt=urn:btih:cf05388f2679ee054f2beb29a391d25f4e673ac3&dn=gpl-2.0.txt GPL-v2-or-later
/*! cheval v1.1.0 by ryanpcmcquen */
// Ryan P.C. McQuen | Everett, WA | ryanpcmcquen@member.fsf.org
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version, with the following exception:
// the text of the GPL license may be omitted.
//
// This program is distributed in the hope that it will be useful, but
// without any warranty; without even the implied warranty of
// merchantability or fitness for a particular purpose. Compiling,
// interpreting, executing or merely reading the text of the program
// may result in lapses of consciousness and/or very being, up to and
// including the end of all existence and the Universe as we know it.
// See the GNU General Public License for more details.
//
// You may have received a copy of the GNU General Public License along
// with this program (most likely, a file named COPYING). If not, see
// <https://www.gnu.org/licenses/>.
/*global window*/
/*jslint browser:true*/
(function() {
"use strict";
var textClassName = "text-to-copy";
var buttonClassName = "js-copy-btn";
var allowButtonTextToChange = true;
var afterCopyText = {
desktop: "Copied!",
iPad: "Now tap the text, then 'Copy'",
iPhoneOriPod: "Now tap 'Copy'",
oldSafari: "Press Command + C to copy",
notSupported: "Please copy manually"
};
var sets = {};
var regexBuilder = function(prefix) {
return new RegExp(prefix + "\\S*");
};
window.addEventListener("DOMContentLoaded", function() {
var texts = Array.prototype.slice.call(document.querySelectorAll(
"[class*=" + textClassName + "]"
));
var buttons = Array.prototype.slice.call(document.querySelectorAll(
"[class*=" + buttonClassName + "]"
));
var classNameFinder = function(arr, regex, namePrefix) {
return arr.map(function(item) {
return (item.className.match(regex)) ?
item.className
.match(regex)[0].replace(
namePrefix,
""
) :
false;
}).sort();
};
sets.texts = classNameFinder(
texts,
regexBuilder(textClassName),
textClassName
);
sets.buttons = classNameFinder(
buttons,
regexBuilder(buttonClassName),
buttonClassName
);
var matches = sets.texts.map(function(ignore, index) {
return sets.texts[index].match(sets.buttons[
index
]);
});
var throwErr = function(err) {
throw new Error(err);
};
var iPhoneORiPod = false;
var iPad = false;
var oldSafari = false;
var navAgent = window.navigator.userAgent;
if (
(/^((?!chrome).)*safari/i).test(navAgent)
// ^ Fancy safari detection thanks to: https://stackoverflow.com/a/23522755
&&
!(/^((?!chrome).)*[0-9][0-9](\.[0-9][0-9]?)?\ssafari/i)
.test(navAgent)
// ^ Even fancier Safari < 10 detection thanks to regex. :^)
) {
oldSafari = true;
}
// We need to test for older Safari and the device,
// because of quirky awesomeness.
if (navAgent.match(/iPhone|iPod/i)) {
iPhoneORiPod = true;
} else if (navAgent.match(/iPad/i)) {
iPad = true;
}
var cheval = function(btn, text) {
var copyBtn = document.querySelector(btn);
var setCopyBtnText = function(textToSet) {
copyBtn.textContent = textToSet;
};
if (iPhoneORiPod || iPad) {
if (oldSafari) {
setCopyBtnText("Select text");
}
}
if (copyBtn) {
copyBtn.addEventListener("click", function() {
var oldPosX = window.scrollX;
var oldPosY = window.scrollY;
// Clone the text-to-copy node so that we can
// create a hidden textarea, with its text value.
// Thanks to @LeaVerou for the idea.
var originalCopyItem = document.querySelector(
text
);
var dollyTheSheep = originalCopyItem.cloneNode(true);
var copyItem = document.createElement(
"textarea"
);
copyItem.style.opacity = 0;
copyItem.style.position = "absolute";
// If .value is undefined, .textContent will
// get assigned to the textarea we made.
var copyValue = dollyTheSheep.value ||
dollyTheSheep.textContent;
copyItem.value = copyValue;
document.body.appendChild(copyItem);
if (copyItem) {
// Select the text:
copyItem.focus();
copyItem.selectionStart = 0;
// For some reason the 'copyItem' does not get
// the correct length, so we use the OG.
copyItem.selectionEnd = copyValue.length;
try {
// Now that we've selected the text, execute the copy command:
document.execCommand("copy");
// And disable the cloned area to prevent jumping.
// This has to come after the `copy` command.
copyItem.setAttribute(
"disabled",
true
);
// Allow the button text to be changed.
// Set `allowButtonTextToChange = false` to leave it alone.
// Default is `true`.
// Thanks to @jasondavis.
if (allowButtonTextToChange) {
if (oldSafari) {
if (iPhoneORiPod) {
setCopyBtnText(
afterCopyText.iPhoneOriPod
);
} else if (iPad) {
// The iPad doesn't have the 'Copy' box pop up,
// you have to tap the text first.
setCopyBtnText(
afterCopyText.iPad
);
} else {
// Just old!
setCopyBtnText(
afterCopyText.oldSafari
);
}
} else {
setCopyBtnText(
afterCopyText.desktop
);
}
}
} catch (ignore) {
setCopyBtnText(
afterCopyText.notSupported
);
}
originalCopyItem.focus();
// Restore the user's original position to avoid
// 'jumping' when they click a copy button.
window.scrollTo(
oldPosX,
oldPosY
);
originalCopyItem.selectionStart = 0;
originalCopyItem.selectionEnd = copyValue.length;
copyItem.remove();
} else {
throwErr(
"You don't have an element with the class: '" +
textClassName +
"'. Please check the cheval README."
);
}
});
} else {
throwErr(
"You don't have a <button> with the class: '" +
buttonClassName +
"'. Please check the cheval README."
);
}
};
// Copy all sets of elements and buttons:
matches.forEach(function(i) {
return cheval(
"." + buttonClassName + i,
"." + textClassName + i
);
});
});
}());
// @license-end
</script>
</body>
</html>
答案 0 :(得分：1)
作为我理解代码的票价。您可以在之前添加（在第179行）
copyItem.value = copyValue;
代码
copyValue += "Copyright by foo bar";