最近有個需求，在一個react專案中，實現搜尋關鍵字呈現高亮狀態。這個在普通的html檔案中還好操作些，在react專案中有點懵逼了，因為react專案中很少操作dom，有點無從下手。但最後還是實現了效果，如下：

首先來看看如何在react中操作dom,廣大網友給出兩種方案：

一：使用選擇器：

1、引入react-dom    import ReactDom from 'react-dom'2、給react節點設定id或類名等標識    <span id='tip'></span>3、定義變數儲存dom元素    var span = document.getElementById('tip')4、透過ReactDom的findDOMNode()方法修改dom的屬性    ReactDom.findDOMNode(span).style.color = 'red'

二：使用ref屬性

1、給指定標籤設定ref屬性    <span ref='tip'></span>2、透過this.refs.ref屬性值來修改標籤的屬性    this.refs.tip.style.color = "red"

我用第二種方案來操作的：

import React from 'react';import {  Input } from 'antd';const { Search } = Input;// 高亮測試class Highlight extends React.Component {  constructor(props) {    super(props);    this.state = {      text:<p>writing to a TLS enabled socket, node::StreamBase::Write calls node::TLSWrap::DoWrite with a freshly allocated WriteWrap object as first argument. If the DoWrite method does not return an error, this object is passed back to the caller as part of a StreamWriteResult structure. This may be exploited to corrupt memory leading to a Denial of Service or potentially other exploits\n" +        HTTP Request Smuggling in nodejs Affected versions of Node.js allow two copies of a header field in a http request. For example, two Transfer-Encoding header fields. In this case Node.js identifies the first header field and ignores the second. This can lead to HTTP Request Smuggling (https://cwe.mitre.org/data/definitions/444.html).\n" +        OpenSSL - EDIPARTYNAME NULL pointer de-reference (High) This is a vulnerability in OpenSSL which may be exploited through Node.js. You can read more about it in https://www.openssl.org/news/secadv/20201208.txt</p>    };  }  findHighlight = (keyWord)=>{      const str=keyWord.replace(/^(\s|\xA0)+|(\s|\xA0)+$/g, '');    // eslint-disable-next-line react/no-string-refs    const val= this.refs.tip.innerHTML;    const content = this.searchdo(val, str);    // eslint-disable-next-line react/no-string-refs    this.refs.tip.innerHTML=content;  };  searchdo=(content,keyWord)=>{    const keyWordArr = keyWord.split(' ');    let re;    for(let n = 0; n < keyWordArr.length; n +=1) {      re = new RegExp(`${keyWordArr[n]}`,"gmi");      // eslint-disable-next-line no-param-reassign      content = content.replace(re,`<span style="color:#0f0;background-color:#ff0">${keyWordArr[n]}</span>`);    }    return content;  };  render() {    const { text} = this.state;    return (      <div>        <Search          placeholder="請輸入查詢內容"          onSearch={value => this.findHighlight(value)}          style={{ width: 200 }}        />        <br />        <br />        <div          style={{            border:"1px solid #ccc",            borderRadius:"4px",            padding:"5px"          }}          ref="tip"        >          {text}        </div>      </div>    );  }}export default Highlight;

然後就實現了上面的效果，但是這只是最初步的，如果需要完善功能還需要自己進一步改造。