CSS0000： flex弹性布局 toggle改变样式 延迟加载 js css

1，让body中所有元素 上下左右居中

    body {
      display: flex;
      justify-content: center;
      align-items: center;
      background: #F8FFAE;
      background: -webkit-linear-gradient(-65deg, #43C6AC, #F8FFAE);
      background: linear-gradient(-65deg, #43C6AC, #F8FFAE);
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

2，flex 弹性布局

display:flex 意思是弹性布局

刚吃的html部分不变，css部分

父级元素定义display:flex,子元素宽度用flex来定义,flex:1 是均分父级元素。占的比例相同

1:2分时

同样分为3份时

3， toggle改变样式

css

      .audio.green-audio-player .volume .volume-btn {

        cursor: pointer;

      }

      .audio.green-audio-player .volume .volume-btn.open path {

        fill: #44BFA3;

      }

 js:

var volumeBtn = audioPlayer.querySelector('.volume-btn');

volumeBtn.classList.toggle('open');

 

html:

          <div class="volume-btn">

            <svg xmlns="" width="24" height="24" viewBox="0 0 24 24">

              <path fill="#566574" fill-rule="evenodd" d=" 7.693H0z" id="speaker">

            </svg>

          </div>

 

 

4，延迟加载 js css

 

    // 延迟加载js css
    function dynamicLoadJs(e, n) {
        var t = document.getElementsByTagName("head")[0],
            a = document.createElement("script");
        a.type = "text/javascript", a.src = e, "function" == typeof n && (a.onload = a.onreadystatechange = function() {
            this.readyState && "loaded" !== this.readyState && "complete" !== this.readyState || (n(), a.onload = a.onreadystatechange = null)
        }), t.appendChild(a)
    }
    function dynamicLoadCss(e) {
        var n = document.getElementsByTagName("head")[0],
            t = document.createElement("link");
        t.type = "text/css", t.rel = "stylesheet", t.href = e, n.appendChild(t)
    }
    var lan = "./ver/lang/",
        prx = "",
        II = !1;
    dynamicLoadCss(prx + "ver/css/in.css"), 
    dynamicLoadJs(prx + "ver/js/ic.js", function() {}), 
    dynamicLoadJs(prx + "ver/js/ve.js", function() {}), 
    dynamicLoadJs(prx + "ver/js/ap.js", function() {
        var e = document.createElement("div");
        e.id = "loadgif", document.body.appendChild(e);
        var n = document.createElement("img");
        n.src = A.b + "/des.png", n.id = "desImg", 
        n.style = "display:none; position: absolute; 500px; z-index: 999; pointer-events: none;", 
        document.body.appendChild(n), 
        dynamicLoadJs(prx + "ver/js/in.js", function() {})
    });