<el-input v-model="keyWord" placeholder="请输入关键字搜索" clearable></el-input>
        <el-button tyPE="success" icon="el-icon-seArch" @click="search"></el-button>

//请求数据库数据的方法
    getData(offset,limit){
      this.axios.post('/php/search.php', qs.stringify({
        offset: offset,
        limit: limit,
        keyWord: this.keyWord
      }), { headers: { 'Content-type': 'application/x-www-form-urlencoded' } }).then((res) => {
        this.total = res.data.total
        this.resultList = res.data.data
      }).catch((err) => {
        this.$message.error(err)
      })

<?php
$servername = "主机地址";
$username = "账户";
$password = "密码";
$dbname = "数据库名称";

// 创建连接
$conn = new MySQLi($servername, $username, $password, $dbname);
// Check connection
if ($conn->connect_error) {
    die("连接失败: " . $conn->connect_error);
} 

$keyWord = $_POST['keyWord'];
//获取前端的参数 开始和结束number
if ( !isset( $_POST['offset'] ) ) {
 echo 0;
 exit();
};
$offset = ( int )$_POST['offset'];

if ( !isset( $_POST['limit'] ) ) {
 echo 0;
 exit();
};
$limit = ( int )$_POST['limit'];
//分页查询数据库
$sql = "SELECT * From posts where title like '%$keyWord%' order by id desc LIMIT $limit OFFSET $offset";
$result = $conn->query($sql);

$sqlGetCount = "SELECT COUNT(*) cnt From posts where title like '%$keyWord%'";
$rescnt = $conn->query($sqlGetCount);
$rescnt = $rescnt->fetch_assoc();
$arr = array();
if ($result->num_rows > 0) {
 while ( $row = $result->fetch_assoc() ) {
    array_push( $arr, $row );
}
 //echo json_encode( $arr, JSON_UNESCAPED_UNICODE );
 echo json_encode(array_merge(array('data'=>$arr),array('total'=>(int)$rescnt['cnt'])));
 
} else {
    echo 0;
}
mysqli_close( $conn );
?>

SELECT * FROM posts where title like '%$keyWord%' order by id desc LIMIT $limit OFFSET $offset;