library/test.html at master · chenky/library · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      .parent {
        width: 200px;
        height: 200px;
        background-color: blue;
      }
      .child {
        width: 50px;
        height: 50px;
        background-color: red;
        margin: auto;
      }
    </style>
  </head>
  <body>
    <div id="useragent"></div>
    <div class="parent">
      <div class="child">child</div>
    </div>
    <script>
      // Array.prototype.shuffle = function () {
      //   let j;
      //   let i = this.length;
      //   while (i > 0) {
      //     j = parseInt(Math.random() * i);
      //     i--;
      //     [this[j], this[i]] = [this[i], this[j]];
      //   }
      //   return this;
      // };
      // // 带权重的数组乱序，格式[{value:"val1", priority:1},{value:"val2", priority:9},...]
      // // priority的值在[0,1]之间，包括0，小于1
      // Array.prototype.shuffleWithPriority = function () {
      //   let prioritySum = this.reduce(
      //     (total, elem) => total + elem.priority,
      //     0
      //   );
      //   let j;
      //   let i = this.length;
      //   while (i > 0) {
      //     let rnd = Math.random()
      //     j = parseInt(rnd * i);
      //     i--;
      //     console.log((this[i].priority/prioritySum), rnd);
      //     if((this[i].priority/prioritySum)>rnd && !this[j].switch){
      //       [this[j], this[i]] = [this[i], this[j]];
      //       this[j].switch = true;
      //     }
      //   }
      //   return this;
      // };
      // Array.prototype.random = function () {
      //   const len = this.length;
      //   return this[parseInt(Math.random() * len)];
      // };

      // // let arr = [1, 2, 3, 4, 5, 6, 7];
      // // console.log(arr.shuffle());
      // // console.log(arr.shuffle());
      // // console.log(arr.random());
      // console.log(
      //   [
      //     { value: 1, priority: 1 },
      //     { value: 2, priority: 10 },
      //     { value: 3, priority: 20 },
      //     { value: 4, priority: 30 },
      //     { value: 5, priority: 50 },
      //     { value: 6, priority: 60 },
      //   ].shuffleWithPriority()

      // );
      //   const ua = navigator.userAgent
      // is chrome
      // const isChrome = /(?:chrome|crios|crmo)\/(\d+(\.?_?\d+)+)/i.test(ua)
      // is safari
      // const isSafari = /(iPhone|iPod|iPad).*AppleWebKit(?=.*Safari)/.test(ua)
      // const isMobile = /[^-]mobi/i.test(ua)
      //   document.querySelector("#useragent").innerText = isChrome + ',' + isSafari + "," + ua+","+isMobile;

      function testPromise(type) {
        if (type === 1) {
          return Promise.resolve("sucess");
        }
        return Promise.reject("error");
      }
      function wrapPro(type) {
        return testPromise(type).catch((err) => {
          console.log("err is " + err);
        });
      }
      wrapPro(1)
        .then((result) => {
          console.log("wrapPro success", "result is " + result);
        })
        .catch((err) => {
          console.log("wrapPro catch err: " + err);
        });
      wrapPro(0)
        .then((result) => {
          console.log("wrapPro success", "result is " + result);
        })
        .catch((err) => {
          console.log("wrapPro catch err: " + err);
        });
    </script>
  </body>
</html>