playground/perf-test.html at master · kiewic/playground · GitHub

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<!doctype html>
<html>
<head>
  <meta charset="utf-8">
  <title>Performance test</title>
</head>
<body>
  <p><a id="test1" href="#">Run Test 1</a></p>
  <p><a id="testConsoleTimeStamp" href="#">Run console timeStamp</a></p>
  <script>
    function test1(e) {
      console.time('test1');
      var foo = [];
      for (var i = 1; i <= 1000; i++) {
        test2(foo, i);
      }
      console.timeEnd('test1');
    }

    function test2(foo, i) {
      for (var j = 1; j <= 100000; j++) {
        if (i * j % 211 === 0) {
          test3(foo);
        }
        else {
          foo.push(i * i - i);
        }
      }
    }

    var k = 0;
    function test3(foo) {
      if (k++ % 1733 === 0) {
        console.count('test3');
        test4();
      }
      foo = [];
    }

    function test4() {
      var chars = document.documentElement.innerHTML.split('');
      var word = [];
      var text = [];
      for (var c of chars) {
        var current = charCode(c);
        if ((current >= charCode('a') && current <= charCode('z')) || (current >= charCode('A') && current <= charCode('Z')) || (current >= charCode('0') && current <= charCode('9')) || current === charCode('-')) {
          word.push(c);
        }
        else if (word.length > 0) {
          text.push(word.join(''));
          word.length = 0;
        }
      }
      if (word.length > 0) {
          text.push(word.join(''));
      }
      console.log(text.join(' ').length);
    }

    function charCode(a) {
      return a.charCodeAt(0);
    }

    function testTimeStamp(foo) {
      console.timeStamp('Hello world!');
    }

    document.getElementById('test1').addEventListener('click', test1);
    document.getElementById('testConsoleTimeStamp').addEventListener('click', testTimeStamp);
  </script>
</body>
</html>