* {      margin: 0;      padding: 0;      box-sizing: border-box;    }    body {      background: #352323 url(images/a.png);    }    img {      display: block;    }    section {      max-width: 95%;      margin: 0 auto;      overflow: hidden;      column-count: 5;      column-gap: 0;      column-fill: auto;    }    figure {      border: 2px solid pink;      margin: 0 5px 10px;      break-inside: avoid;      padding: 5px;    }    figure img {      width: 100%;    }    figcaption {      padding: 10px 0;      text-align: center;      font-weight: 900;      color: #a77869;    }

 <section>    <!-- <figure>      <img src="images/1.jpg"      <figcaption>往后余生，風(fēng)雪是你</figcaption>    </figure> --></section>

window.onload = function() {    var section = document.getElementsByTagName('section')[0];    //運(yùn)行ajax函數(shù)；    ajax('get', 'active.php', 'num=10', function(data) {      //解析json對(duì)象      let img_data = JSON.parse(data);      console.log(img_data);      //循環(huán)建多少圖片配多少標(biāo)簽      for (let i = 0; i < img_data.length; i++) {        //建立figure標(biāo)簽        let figure = document.createElement('figure');        //創(chuàng)建兩個(gè)子元素img和figcaption，并賦值        let img = document.createElement('img');        img.src = img_data[i];        let figcaption = document.createElement('figcaption');        figcaption.innerHTML = '往后余生，風(fēng)雪是你';        //插節(jié)點(diǎn)        figure.appendChild(img);        figure.appendChild(figcaption);        section.appendChild(figure);      }    });    document.onscroll = function() {      var scrollTop = document.documentElement.scrollTop; //距離網(wǎng)頁(yè)高度      console.log(scrollTop);      // var ks = document.documentElement.clientHeight; //可是化窗口高度      var ks = window.innerHeight || document.documentElement.clientHeight; //可是化窗口高度/兼容方法      var ht = document.documentElement.offsetHeight; //html總高度      // console.log(ht);      if (scrollTop + 1 >= ht - ks) { //鼠標(biāo)滾動(dòng)的距離大于html總高度-窗口的距離(也就是html在可視窗口之下的總高度)時(shí) 觸發(fā)函數(shù);        //執(zhí)行函數(shù)        ajax('get', 'active.php', 'num=10', function(data) {          //解析json對(duì)象          let img_data = JSON.parse(data);          console.log(img_data);          //循環(huán)建多少圖片配多少標(biāo)簽          for (let i = 0; i < img_data.length; i++) {            //建立figure標(biāo)簽            let figure = document.createElement('figure');            //創(chuàng)建兩個(gè)子元素img和figcaption，并賦值            let img = document.createElement('img');            img.src = img_data[i];            let figcaption = document.createElement('figcaption');            figcaption.innerHTML = '往后余生，風(fēng)雪是你';            //插節(jié)點(diǎn)            figure.appendChild(img);            figure.appendChild(figcaption);            section.appendChild(figure);          }        });      }    }  };

/** * ajax封裝 * @param {string} mehod請(qǐng)求數(shù)據(jù)方法 * @param {string} url 請(qǐng)求地址 * @param {string} data 請(qǐng)求參數(shù) * @param {[functiong]} success [請(qǐng)求成功之后執(zhí)行的函數(shù)0] * @return {[none]} none */function ajax(mehod, url, data, success) {  var xhr = null;  if (window.XMLHttpRequest) {    xhr = new XMLHttpRequest();  } else {    xhr = new ActiveXObject("Microsoft.xmlhttp")  }  //如果有參數(shù)get方法需要拼接字符串url+?+data  if (mehod === 'get' && data) {    url += '?' + data;  }  //open方法  xhr.open(mehod, url, true);  //send方法  if (mehod === 'get') {    xhr.send();  } else {    xhr.setRequestHeader('content-type', 'application/x-www-form-urlencoded');    xhr(data);  }  xhr.onreadystatechange = function() {    if (xhr.readyState === 4 && xhr.status === 200) {      success && success(xhr.responseText);    }  }

<?php header("Content-type:text/html;charset=utf-8");$num = $_GET['num']; // api調(diào)用者傳遞的需要的圖片頁(yè)數(shù) $img = file("img.txt");// var_dump($img);$array_url = array();for($i=0;$i<$num;$i++){  $url = array_rand($img);  array_push($array_url,$img[$url]);}$a = json_encode($array_url);echo $a;