我已经在代码框中添加了复制到剪贴板按钮。问题是我想要将按钮定位到右上角，但我无法自定义它的位置，而且文字超出了代码框，尝试了
word-break但没有效果。按钮功能不正常，请帮忙解决。强调：我不想使用overflow: hidden属性。
function selectElementContents(el) {
// Copy textarea, pre, div, etc.
if (document.body.createTextRange) {
// Internet Explorer
var textRange = document.body.createTextRange();
textRange.moveToElementText(el);
textRange.select();
textRange.execCommand("Copy");
}
else if (window.getSelection && document.createRange) {
// Non-Internet Explorer
var range = document.createRange();
range.selectNodeContents(el);
var sel = window.getSelection();
sel.removeAllRanges();
sel.addRange(range);
try {
var successful = document.execCommand('copy');
var msg = successful ? 'successful' : 'unsuccessful';
console.log('Copy command was ' + msg);
}
catch (err) {
console.log('Oops, unable to copy');
}
}
} // end function selectElementContents(el)
function make_copy_button(el) {
var copy_btn = document.createElement('input');
copy_btn.type = "button";
el.parentNode.insertBefore(copy_btn, el.nextSibling);
copy_btn.onclick = function() {
selectElementContents(el);
};
if (document.queryCommandSupported("copy") || parseInt(navigator.userAgent.match(/Chrom(e|ium)\/([0-9]+)\./)[2]) >= 42) {
// Copy works with Internet Explorer 4+, Chrome 42+, Firefox 41+, Opera 29+
copy_btn.value = "Copy to Clipboard";
}
else {
// Select only for Safari and older Chrome, Firefox and Opera
copy_btn.value = "Select All (then press Ctrl + C to Copy)";
}
}
/* Note: document.queryCommandSupported("copy") should return "true" on browsers that support copy,
but there was a bug in Chrome versions 42 to 47 that makes it return "false". So in those
versions of Chrome feature detection does not work!
See https://code.google.com/p/chromium/issues/detail?id=476508
*/
make_copy_button(document.getElementById("markup"));.codebox { background-color: #f3f3f6; border-radius: .25rem; padding: 2.25rem 2.25rem 2.25rem 2.5rem; margin: 1.2rem 0 1.2rem; border: 2px solid #d5d5d8; position: relative; }
.codebox:before{ content: ''; position: absolute; background-image: url(data:image/svg+xml;base64,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); background-repeat: no-repeat; background-size: cover; top: -7px; left: 20px; width: 52px; height: 8px; }
.codebox p{font-size:16px;margin-left: 29px;margin-bottom: 0;}
.codebox p:before{ content: ''; width: 1.5rem;margin-left: 16px; height: 1.5rem;left: -4px; position: absolute; top: 21px; background-image: url(data:image/svg+xml;base64,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); }
<pre id="markup">
<div class="codebox"><p>
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</div>
</pre>