update

61844664 · wildfirecode · 61844664 · 61844664
Commit 61844664 authored Mar 20, 2018 by wildfirecode
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Showing with 61 additions and 0 deletions

index.html index.html +22 -0

index.js index.js +39 -0

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--- a/index.html
+++ b/index.html
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <meta http-equiv="X-UA-Compatible" content="ie=edge">
+    <title>Document</title>
+</head>
+<body>
+    <script src="index.js"></script>
+    <script>
+         window.__fpscallback__ = (fps) => {
+            console.log(`fps=${fps}`)
+        }
+        __startFpsFunc__()
+    </script>
+</body>
+</html>
\ No newline at end of file
--- a/index.js
+++ b/index.js
+"use strict";
+(function () {
+    var beginTime = (performance || Date).now();
+    var prevTime = beginTime;
+    var frames = 0;
+    var MAX = 2;
+    var count = MAX;
+    var totalFrames = 0;
+    var begin = function () {
+        beginTime = (performance || Date).now();
+    };
+    var end = function () {
+        frames++;
+        var time = (performance || Date).now();
+        if (time >= prevTime + 1000) {
+            console.log(frames);
+            totalFrames += frames;
+            count--;
+            prevTime = time;
+            frames = 0;
+        }
+        return count;
+    };
+    var animate = function () {
+        begin();
+        var count = end();
+        if (count == 0) {
+            var fps = Math.floor(totalFrames / MAX);
+            window['__fpscallback__'] && window['__fpscallback__'](fps);
+            return;
+        }
+        requestAnimationFrame(animate);
+    };
+    window['__startFpsFunc__'] = function () {
+        beginTime = (performance || Date).now();
+        prevTime = beginTime;
+        animate();
+    };
+})();