let pEle = document.querySelector('p') const targetStr = '牛客网' pEle.outerHTML = pEle.outerHTML.split(targetStr).join(`<b>${targetStr}</b>`)
<p><b>牛客网</b>,程序员必备求职神器</p>
var p = document.querySelector('p'); p.innerHTML = '<strong>牛客网</strong>,程序员必备求职神器'
let p1 = document.querySelector('p'); p1.innerHTML = p1.innerHTML.replace('牛客网', '<strong>牛客网</strong>');
<p><strong>牛客网</strong>,程序员必备求职神器</p>
const p = document.querySelector('p') p.innerHTML = p.textContent.replace(/牛客网/g, '<strong>牛客网</strong>')
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