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<!doctype html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
</head>
<body>
​
<style>
  body {
​
  }
​
  .target {
    width: 100px;
    height: 100px;
    background-color: red;
    margin-bottom: 10px;
  }
​
  button {
    font-size: 16px;
  }
</style>
​
​
<div class="target"></div>
<button class="click1">阻塞主线程</button>
<button class="click2">WebWorker</button>
<button class="click3">任务拆分</button>
<div class="res">
</div>
​
<script>
​
  var timer = {
    save: function() {
      this.last = Date.now();
    },
​
    clock: function() {
      return Date.now() - this.last;
    }
  };
​
​
  (function() {
    'use strict';
​
    const MAX = 4000000;
​
    var target = document.querySelector('.target');
    var res = document.querySelector('.res');
    var click1 = document.querySelector('.click1');
    var click2 = document.querySelector('.click2');
    var click3 = document.querySelector('.click3');
//    var width = document.documentElement.clientWidth - 100;
    var width = 400;
​
    var last = Date.now();
​
    function run() {
      var now = Date.now();
      var percent = (now - last) / 11390 % 1;
      var x = percent * width;
      target.style.transform = 'translate(' + x + 'px, 0)';
      requestAnimationFrame(run);
    }
​
    run();
​
    (function() {
​
      var blob = new Blob(['var solve = function(MAX) {var k = MAX + 1;var sum = 0;while (k) {k--;sum += Math.random();}return sum / MAX;};onmessage = function(e) {postMessage(solve(e.data));};']);
      var blobURL = window.URL.createObjectURL(blob);
​
      var worker = new Worker(blobURL);
​
      worker.onmessage = function(e) {
        var d = timer.clock();
        var data = e.data.toFixed(2);
        res.innerHTML += `<p>${data} worker ${d}ms</p>`
      };
​
      click2.onclick = function() {
        timer.save();
        worker.postMessage(MAX);
      }
​
    })();
​
​
    (function() {
​
      var solve = (function() {
​
        var waitList = [];
        var cb;
​
        function run(sum) {
          if (waitList.length === 0) {
            cb && cb(sum / MAX);
          } else {
            sum += waitList.shift()();
            requestAnimationFrame(run.bind(this, sum));
          }
        }
​
        let solveFrame = function(k) {
​
          var sum = 0;
          while (k) {
            k--;
            sum += Math.random();
          }
          return sum;
​
        };
​
        return function(callback) {
          var k = 40;
          const K = k;
          while (k) {
            k--;
            waitList.push(solveFrame.bind(this, MAX / K));
          }
          cb = callback;
          run(0);
        }
​
      })();
​
​
      click3.onclick = function() {
​
        timer.save();
​
        solve(function(r) {
          var s = r.toFixed(2);
          var d = timer.clock();
          res.innerHTML += `<p>${s} 任务拆分 ${d}ms</p>`
        });
​
      };
​
    })();
​
    (function() {
​
      var solve = function() {
​
        var k = MAX + 1;
​
        var sum = 0;
​
        while (k) {
          k--;
          sum += Math.random();
        }
​
        return sum / MAX;
      };
​
​
      click1.onclick = function() {
        timer.save();
        var r = solve().toFixed(2);
        var d = timer.clock();
        res.innerHTML += `<p>${r} 阻塞式 ${d}ms</p>`
      };
​
​
    })();
​
​
  })();
​
</script>
​
​
</body>
</html>
Output 300px

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