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原生JS實(shí)現(xiàn)圖片網(wǎng)格式漸顯、漸隱效果

更新時(shí)間：2017年06月05日 09:09:20 作者：悠悠洛

這篇文章主要介紹了原生JS實(shí)現(xiàn)圖片網(wǎng)格式漸顯、漸隱效果,需要的朋友可以參考下

先給出效果圖：

　　寫(xiě)的小組件支持圖片的漸顯、漸隱，并且可以是有序、隨機(jī)兩種方式。

　　我采用的原型是屬性寫(xiě)在構(gòu)造函數(shù)內(nèi)，方法寫(xiě)在原型對(duì)象內(nèi)。方法寫(xiě)構(gòu)造函數(shù)內(nèi)有個(gè)問(wèn)題，就是每次調(diào)用這個(gè)方法就相當(dāng)于重新實(shí)例化一次，舉個(gè)粟子：

　　實(shí)現(xiàn)網(wǎng)格效果的原理上是將讀取圖片的寬高，按照設(shè)定的參數(shù)，分成等高寬的網(wǎng)格（我用的span標(biāo)簽表示的網(wǎng)格），網(wǎng)格利用定位鋪滿整個(gè)圖片，每個(gè)網(wǎng)格的背景圖都是原圖片，原理同sprite，利用background-position屬性改變顯示區(qū)域。接下來(lái)就是按照設(shè)定的順序?qū)崿F(xiàn)漸顯或漸隱。漸顯或漸隱用的是JS的animation屬性和CSS3的animation屬性在屬性值上有所區(qū)別，這次使用也才知道JS的animation屬性里有個(gè)animationFillMode（規(guī)定當(dāng)動(dòng)畫(huà)不播放時(shí)（當(dāng)動(dòng)畫(huà)完成時(shí)，或當(dāng)動(dòng)畫(huà)有一個(gè)延遲未開(kāi)始播放時(shí)），要應(yīng)用到元素的樣式。）屬性值。

　　我綁定的事件是點(diǎn)擊，完全可以用其他事件或頁(yè)面加載觸發(fā)。我的代碼稍加改動(dòng)就可以實(shí)現(xiàn)網(wǎng)格式輪播圖。

　　下面給出源代碼：

<!doctype html>
<head>
<title>網(wǎng)格效果</title>
<style>
  @charset "utf-8";
  /*css reset*/
  html{font-family:"Helvetica Neue",Helvetica,STHeiTi,sans-serif;-webkit-text-size-adjust:100%;-moz-text-size-adjust:100%;-ms-text-size-adjust:100%;}
  body{-webkit-overflow-scrolling:touch;margin:0;}
  ul{margin:0;padding:0;list-style:none;outline:none;}
  dl,dd{margin:0;}
  a{display:inline-block;margin:0;padding:0;text-decoration:none;background:transparent;outline:none;color:#000;}
  a:link,a:visited,a:hover,a:active{text-decoration:none;color:currentColor;}
  a,dt,dd{-webkit-touch-callout:none;-webkit-tap-highlight-color:transparent;}
  img{border:0;}
  p{margin:0;}
  input,button,select,textarea{margin:0;padding:0;border:0;outline:0;background-color:transparent;}
  /*css*/
  .origin-pic {
    display: inline-block;
    width: 200px;
    height: 200px;
  }
  .grid-area {
    display: inline-block;
    position: relative;
    width: 200px;
    height: 200px;
  }
  .grid {
    position: absolute;
  }
  #img1 {
    opacity: 1;
    width: 200px;
    height: 200px;
  }
  @keyframes fadeout{
    0% {opacity: 1}
    100% {opacity: 0}
  }
  @keyframes fadein{
    0% {opacity: 0}
    100% {opacity: 1}
  }
</style>
</head>
<body>
<div>
  <img class="origin-pic" src="./pic.jpg" />
</div>
<div id="grid_area" class="grid-area">
  <img id="img1" src="./pic.jpg" />
</div>
<script>
var gridSetting = {
  'cell': 10, // 行、列數(shù)量
  'mode': 'fadeout', // 備選參數(shù): fadeout, fadein
  'sort': 'random', // 備選參數(shù): inturn, random
  'num': 1, // 每次發(fā)生動(dòng)作的網(wǎng)格數(shù)，目前只支持1
  complete: function() { // 事件完成時(shí)的回調(diào)函數(shù)
    console.log('ok!');
  }
};
var img1 = document.getElementById('img1');
(function(doc, setting, ele) {
  var defaults = {
    'speed': 20,
  };
  function Grid(ele) {
    this.ele = ele;
    this.settings = Object.assign({}, setting, defaults);
  }
  Grid.prototype = {
    constructor: Grid,
    // 構(gòu)建UI
    _create: function() {
      var img = this.ele,
        settings = this.settings,
        cell = settings.cell,
        imgWidth = img.width,
        imgHeight = img.height,
        gridWidth = imgWidth / cell, // 每個(gè)網(wǎng)格寬度
        gridHeight = imgHeight / cell, // 每個(gè)網(wǎng)格高度
        currentTop = 0,
        currentLeft = 0,
        fragment = doc.createDocumentFragment(),
        i = 0,
        gridArr = [];
      img.style.display = 'none';
      for (; i < cell * cell; i++) {
        var spanNode = doc.createElement('span');
        spanNode.setAttribute('id', i);
        spanNode.style.cssText +=  'position: absolute;' +
                      'top: ' + currentTop + 'px;' +
                      'left: ' + currentLeft + 'px;' +
                      'margin: 0;' +
                      'padding: 0;' +
                      'width: ' + gridWidth + 'px;' +
                      'height: ' + gridHeight + 'px;' +
                      'opacity:' + settings.opacity + ';' +
                      'background: url('+ img.src + ');' +
                      'background-size: ' + imgWidth + 'px ' + imgHeight + 'px;' +
                      'background-position: -' + currentLeft + 'px -' + currentTop + 'px;';
        if (currentLeft < (imgWidth - gridWidth)) {
          currentLeft += gridWidth;
        } else {
          currentLeft = 0;
          currentTop += gridHeight;
        }
        fragment.append(spanNode);
        gridArr.push(i);
      }
      this.gridArr = gridArr;
      doc.getElementById('grid_area').append(fragment);
    },
    // 漸顯、漸隱
    _fade: function() {
      var gridArr = this.gridArr,
        cloneArr = gridArr.slice(0),
        length = gridArr.length,
        settings = this.settings,
        sort = settings.sort,
        i = 0;
      switch(settings.mode) {
        case 'fadeout':
          if (sort == 'inturn') {
            // 按順序漸隱
            var timer = setInterval(function() {
              doc.getElementById(gridArr[i]).style.animation = "fadeout 1s forwards";
              i++;
              if (i >= settings.cell * settings.cell) {
                clearInterval(timer);
                settings.complete();
              }
            }, settings.speed)
          } else if (sort == 'random') {
            // 隨機(jī)漸隱
            var timer = setInterval(function() {
              i = cloneArr.splice(Math.random() * length--, 1);
              doc.getElementById(gridArr[i]).style.animation = "fadeout 1s forwards";
              if (length == 0) {
                clearInterval(timer);
                settings.complete();
              }
            }, settings.speed)
          }
          break;
        case 'fadein':
          if (sort == 'inturn') {
            // 按順序漸漸顯
            var timer = setInterval(function() {
              doc.getElementById(gridArr[i]).style.animation = "fadein 1s forwards";
              i++;
              if (i >= settings.cell * settings.cell) {
                clearInterval(timer);
                settings.complete();
              }
            }, settings.speed)
          } else if (sort == 'random') {
            // 隨機(jī)漸顯
            var timer = setInterval(function() {
              i = cloneArr.splice(Math.random() * length--, 1);
              doc.getElementById(gridArr[i]).style.animation = "fadein 1s forwards";
              if (length == 0) {
                clearInterval(timer);
                settings.complete();
              }
            }, settings.speed)
          }
          break;
        default:
          console.log('配置錯(cuò)誤！');
      }
    },
    _checkMode: function() {
      if (this.settings.mode == 'fadein') {
        this.settings.opacity = 0;
      } else {
        this.settings.opacity = 1;
      }
    },
  };
  var gridArea = doc.getElementById('grid_area');
  gridArea.addEventListener('click', function() {
    var event = new Grid(ele);
    event._checkMode();
    event._create();
    event._fade();
  }, false);
})(document, gridSetting, img1);
</script>
</body>
</html>

以上所述是小編給大家介紹的原生JS實(shí)現(xiàn)圖片網(wǎng)格式漸顯、漸隱效果，希望對(duì)大家有所幫助，如果大家有任何疑問(wèn)請(qǐng)給我留言，小編會(huì)及時(shí)回復(fù)大家的。在此也非常感謝大家對(duì)腳本之家網(wǎng)站的支持！

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