如果你调用该函数
highlight(employee);
该函数在 ECMAScript 2018+ 中如下所示：
function highlight(employee){
Array.from(document.querySelectorAll("body, body *:not(script):not(style):not(noscript)"))
.flatMap(({childNodes}) => [...childNodes])
.filter(({nodeType, textContent}) => nodeType === document.TEXT_NODE && textContent.includes(employee))
.forEach((textNode) => textNode.replaceWith(...textNode.textContent.split(employee).flatMap((part) => [
document.createTextNode(part),
Object.assign(document.createElement("mark"), {
textContent: employee
})
])
.slice(0, -1))); // The above flatMap creates a [text, employeeName, text, employeeName, text, employeeName]-pattern. We need to remove the last superfluous employeeName.
}
这是 ECMAScript 5.1 版本：
function highlight(employee){
Array.prototype.slice.call(document.querySelectorAll("body, body *:not(script):not(style):not(noscript)")) // First, get all regular elements under the `<body>` element
.map(function(elem){
return Array.prototype.slice.call(elem.childNodes); // Then extract their child nodes and convert them to an array.
})
.reduce(function(nodesA, nodesB){
return nodesA.concat(nodesB); // Flatten each array into a single array
})
.filter(function(node){
return node.nodeType === document.TEXT_NODE && node.textContent.indexOf(employee) > -1; // Filter only text nodes that contain the employee’s name.
})
.forEach(function(node){
var nextNode = node.nextSibling, // Remember the next node if it exists
parent = node.parentNode, // Remember the parent node
content = node.textContent, // Remember the content
newNodes = []; // Create empty array for new highlighted content
node.parentNode.removeChild(node); // Remove it for now.
content.split(employee).forEach(function(part, i, arr){ // Find each occurrence of the employee’s name
newNodes.push(document.createTextNode(part)); // Create text nodes for everything around it
if(i < arr.length - 1){
newNodes.push(document.createElement("mark")); // Create mark element nodes for each occurrence of the employee’s name
newNodes[newNodes.length - 1].innerHTML = employee;
// newNodes[newNodes.length - 1].setAttribute("class", "highlighted");
}
});
newNodes.forEach(function(n){ // Append or insert everything back into place
if(nextNode){
parent.insertBefore(n, nextNode);
}
else{
parent.appendChild(n);
}
});
});
}
替换单个文本节点的主要好处是事件侦听器不会丢失。该遗址仍然完好无损，仅text变化。
而不是mark元素你也可以使用span并取消注释该行class属性并在 CSS 中指定。
这是我使用此函数和后续函数的示例highlight("Text"); on the MDN 页面Text nodes https://developer.mozilla.org/en/docs/Web/API/Text:
（没有突出显示的一个事件是 SVG 节点超出了<iframe>).
