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实现加载提示组件.md

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实现加载提示组件

在开发时经常需要用到加载提示，例如发起一个XHR请求时就需要给予用户一个交互的反馈，实现一个加载提示组件，重要的部分已经做出注释。

实例

<!DOCTYPE html>
<html>
<head>
    <title>loading</title>
    <style type="text/css">
        #__loading__{ /* 设置遮罩层 */
            position: fixed;
            width: 100%;
            height: 100%;
            top: 0;
            left: 0;
            z-index: -10000;
            opacity: 0;
            visibility: hidden;
            background-color: rgba(255, 255, 255, .9);
            transition: all .5s;
        }

        #__loading__ > .__container__{ /* 内部容器 居中SVG */
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .__show__{ /* 显示 */
            opacity: 1 !important;
            z-index: 10000 !important;
            visibility: visible !important;
            transition: all .5s !important;
        }

        button{
            cursor: pointer;
        }
    </style>
</head>
<body>
    <button onclick="show()" >Loading</button>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
    <div>文字仅作为测试遮罩效果用</div>
</body>
<script>
    class Loading{
        constructor(){
            let uniqueID = "__loading__"; // __开头防止ID冲突
            const exist = document.querySelector("#" + this.uniqueID); // 判断是否已初始化存在DOM结构
            if(exist){
                this.instance = exist; // 存在则实例直接赋予
            }else{
                let instance = document.createElement("div"); // 创建实例
                instance.id = uniqueID;
                instance.innerHTML = `
                    <div class="__container__">
                        <svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="37px" height="37px" viewBox="0 0 50 50" style="enable-background:new 0 0 50 50" xml:space="preserve">
                            <path fill="#4C98F7" d="M43.935,25.145c0-10.318-8.364-18.683-18.683-18.683c-10.318,0-18.683,8.365-18.683,18.683h4.068c0-8.071,6.543-14.615,14.615-14.615c8.072,0,14.615,6.543,14.615,14.615H43.935z" transform="rotate(275.098 25 25)">
                                <animateTransform attributeType="xml" attributeName="transform" type="rotate" from="0 25 25" to="360 25 25" dur="0.6s" repeatCount="indefinite"></animateTransform>
                            </path>
                        </svg>
                    </div>
                `.replace(/[\s]+/g, " ");
                this.instance = instance; // 对象赋值实例
                document.body.appendChild(this.instance); // body下添加实例
            }
        }
        start(){
            this.instance.classList.add("__show__"); // 显示
        }   
        stop(){
            this.instance.classList.remove("__show__"); // 隐藏
        }
    }

    // 作为模块则直接导出实例
    // export default new Loading();

    const loading = new Loading(); 

    function show() {
        loading.start();
        setTimeout(() => loading.stop(), 1000);
    }
</script>

</html>

附带6种SVG实现的LOADING提示动画。

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="30px" height="30px" viewBox="0 0 40 40" enable-background="new 0 0 40 40" xml:space="preserve">
  <path opacity="0.2" fill="#4C98F7" d="M20.201,5.169c-8.254,0-14.946,6.692-14.946,14.946c0,8.255,6.692,14.946,14.946,14.946
      s14.946-6.691,14.946-14.946C35.146,11.861,28.455,5.169,20.201,5.169z M20.201,31.749c-6.425,0-11.634-5.208-11.634-11.634
      c0-6.425,5.209-11.634,11.634-11.634c6.425,0,11.633,5.209,11.633,11.634C31.834,26.541,26.626,31.749,20.201,31.749z"></path>
  <path fill="#4C98F7" d="M26.013,10.047l1.654-2.866c-2.198-1.272-4.743-2.012-7.466-2.012h0v3.312h0
      C22.32,8.481,24.301,9.057,26.013,10.047z" transform="rotate(42.1171 20 20)">
      <animateTransform attributeType="xml" attributeName="transform" type="rotate" from="0 20 20" to="360 20 20" dur="0.5s" repeatCount="indefinite"></animateTransform>
  </path>
</svg>

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="30px" height="30px" viewBox="0 0 50 50" style="enable-background:new 0 0 50 50" xml:space="preserve">
    <path fill="#4C98F7" d="M25.251,6.461c-10.318,0-18.683,8.365-18.683,18.683h4.068c0-8.071,6.543-14.615,14.615-14.615V6.461z" transform="rotate(275.098 25 25)">
        <animateTransform attributeType="xml" attributeName="transform" type="rotate" from="0 25 25" to="360 25 25" dur="0.6s" repeatCount="indefinite"></animateTransform>
    </path>
</svg>

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="30px" height="30px" viewBox="0 0 50 50" style="enable-background:new 0 0 50 50" xml:space="preserve">
    <path fill="#4C98F7" d="M43.935,25.145c0-10.318-8.364-18.683-18.683-18.683c-10.318,0-18.683,8.365-18.683,18.683h4.068c0-8.071,6.543-14.615,14.615-14.615c8.072,0,14.615,6.543,14.615,14.615H43.935z" transform="rotate(275.098 25 25)">
        <animateTransform attributeType="xml" attributeName="transform" type="rotate" from="0 25 25" to="360 25 25" dur="0.6s" repeatCount="indefinite"></animateTransform>
    </path>
</svg>

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="30px" height="30px" viewBox="0 0 24 24" style="enable-background:new 0 0 50 50" xml:space="preserve">
   <rect x="0" y="0" width="4" height="7" fill="#4C98F7" transform="scale(1 1.94336)">
       <animateTransform attributeType="xml" attributeName="transform" type="scale" values="1,1; 1,3; 1,1" begin="0s" dur="0.6s" repeatCount="indefinite"></animateTransform>       
   </rect>
   <rect x="10" y="0" width="4" height="7" fill="#4C98F7" transform="scale(1 2.72331)">
       <animateTransform attributeType="xml" attributeName="transform" type="scale" values="1,1; 1,3; 1,1" begin="0.2s" dur="0.6s" repeatCount="indefinite"></animateTransform>       
   </rect>
   <rect x="20" y="0" width="4" height="7" fill="#4C98F7" transform="scale(1 1.38997)">
       <animateTransform attributeType="xml" attributeName="transform" type="scale" values="1,1; 1,3; 1,1" begin="0.4s" dur="0.6s" repeatCount="indefinite"></animateTransform>       
   </rect>
</svg>

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="24px" height="30px" viewBox="0 0 24 30" style="enable-background:new 0 0 50 50" xml:space="preserve">
    <rect x="0" y="0" width="4" height="10" fill="#4C98F7" transform="translate(0 9.4336)">
        <animateTransform attributeType="xml" attributeName="transform" type="translate" values="0 0; 0 20; 0 0" begin="0" dur="0.6s" repeatCount="indefinite"></animateTransform>
    </rect>
    <rect x="10" y="0" width="4" height="10" fill="#4C98F7" transform="translate(0 17.2331)">
        <animateTransform attributeType="xml" attributeName="transform" type="translate" values="0 0; 0 20; 0 0" begin="0.2s" dur="0.6s" repeatCount="indefinite"></animateTransform>
    </rect>
    <rect x="20" y="0" width="4" height="10" fill="#4C98F7" transform="translate(0 3.89973)">
        <animateTransform attributeType="xml" attributeName="transform" type="translate" values="0 0; 0 20; 0 0" begin="0.4s" dur="0.6s" repeatCount="indefinite"></animateTransform>
    </rect>
</svg>

<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="24px" height="30px" viewBox="0 0 24 30" style="enable-background:new 0 0 50 50" xml:space="preserve">
    <rect x="0" y="9.22656" width="4" height="12.5469" fill="#4C98F7">
        <animate attributeName="height" attributeType="XML" values="5;21;5" begin="0s" dur="0.6s" repeatCount="indefinite"></animate>
        <animate attributeName="y" attributeType="XML" values="13; 5; 13" begin="0s" dur="0.6s" repeatCount="indefinite"></animate>
    </rect>
    <rect x="10" y="5.22656" width="4" height="20.5469" fill="#4C98F7">
        <animate attributeName="height" attributeType="XML" values="5;21;5" begin="0.15s" dur="0.6s" repeatCount="indefinite"></animate>
        <animate attributeName="y" attributeType="XML" values="13; 5; 13" begin="0.15s" dur="0.6s" repeatCount="indefinite"></animate>
    </rect>
    <rect x="20" y="8.77344" width="4" height="13.4531" fill="#4C98F7">
        <animate attributeName="height" attributeType="XML" values="5;21;5" begin="0.3s" dur="0.6s" repeatCount="indefinite"></animate>
        <animate attributeName="y" attributeType="XML" values="13; 5; 13" begin="0.3s" dur="0.6s" repeatCount="indefinite"></animate>
    </rect>
</svg>

每日一题

https://github.com/WindrunnerMax/EveryDay

参考

https://zhuanlan.zhihu.com/p/74440436
https://blog.csdn.net/wo_shi_ma_nong/article/details/88833828
https://github.com/ElemeFE/element/tree/dev/packages/loading/src