引入JS

将以下代码添加到主题header.php中的</head>标签前,或前往<控制台>-<设置外观>-<主题自定义扩展>,将它添加到<自定义 HTML元素拓展>-<标签:head头部(Meta元素后)>

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<script>
// 在代码块右上角添加复制按钮
document.addEventListener('DOMContentLoaded', initCodeCopyButton);
function initCodeCopyButton() {
function initCSS(callback) {
const css = `
.btn-code-copy {
position: absolute;
line-height: .6em;
top: .2em;
right: .2em;
color: rgb(87, 87, 87);
}
.btn-code-copy:hover {
color: rgb(145, 145, 145);
cursor: pointer;
}
`;
const styleId = btoa('btn-code-copy').replace(/[=+\/]/g, '');
const head = document.getElementsByTagName('head')[0];
if (!head.querySelector('#' + styleId)) {
const style = document.createElement('style');
style.id = styleId;
if (style.styleSheet) {
style.styleSheet.cssText = css;
} else {
style.appendChild(document.createTextNode(css));
}
head.appendChild(style);
}
callback();
};
function copyTextContent(source) {
let result = false;
const target = document.createElement('pre');
target.style.opacity = '0';
target.textContent = source.textContent;
document.body.appendChild(target);
try {
const range = document.createRange();
range.selectNode(target);
window.getSelection().removeAllRanges();
window.getSelection().addRange(range);
document.execCommand('copy');
window.getSelection().removeAllRanges();
result = true;
} catch (e) { console.log('copy failed.'); }
document.body.removeChild(target);
return result;
};
function initButton(pre) {
const code = pre.querySelector('code');
if (code) {
const preParent = pre.parentElement;
const newPreParent = document.createElement('div');
newPreParent.style = 'position: relative';
preParent.insertBefore(newPreParent, pre);
const copyBtn = document.createElement('div');
copyBtn.innerHTML = 'copy';
copyBtn.className = 'btn-code-copy';
copyBtn.addEventListener('click', () => {
copyBtn.innerHTML = copyTextContent(code) ? 'success' : 'failure';
setTimeout(() => copyBtn.innerHTML = 'copy', 250);
});
newPreParent.appendChild(copyBtn);
newPreParent.appendChild(pre);
}
};
const pres = document.querySelectorAll('pre');
if (pres.length !== 0) {
initCSS(() => pres.forEach(pre => initButton(pre)));
}
};
</script>

如果你开启了 PJAX,则需单独加入回调函数。将 initCodeCopyButton(); 添加进入即可。

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