stats.js随时查看fps

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">

<head>

	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">

	<title>Document</title>

	<script type="text/javascript" src="./libs/stats.js"></script>

</head>

<body>

	<div id="Stats-output">

	</div>

	<script type="text/javascript">

		var stats = initStats();

		function initStats() {

	            var stats = new Stats();

	            stats.setMode(0); // 0: fps, 1: ms

	            // Align top-left

	            stats.domElement.style.position = 'absolute';

	            stats.domElement.style.left = '0px';

	            stats.domElement.style.top = '0px';

	            document.getElementById("Stats-output").appendChild(stats.domElement);

	            return stats;

	        }

	        setInterval(function(){

	        	stats.update();

	        },500);

	</script>

</body>

</html>

　源码：

/**

 * @author mrdoob / http://mrdoob.com/

 */

var Stats = function () {

    var startTime = Date.now(), prevTime = startTime;

    var ms = , msMin = Infinity, msMax = ;

    var fps = , fpsMin = Infinity, fpsMax = ;

    var frames = , mode = ;

    var container = document.createElement( 'div' );

    container.id = 'stats';

    container.addEventListener( 'mousedown', function ( event ) { event.preventDefault(); setMode( ++ mode %  ) }, false );

    container.style.cssText = 'width:80px;opacity:0.9;cursor:pointer';

    var fpsDiv = document.createElement( 'div' );

    fpsDiv.id = 'fps';

    fpsDiv.style.cssText = 'padding:0 0 3px 3px;text-align:left;background-color:#002';

    container.appendChild( fpsDiv );

    var fpsText = document.createElement( 'div' );

    fpsText.id = 'fpsText';

    fpsText.style.cssText = 'color:#0ff;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px';

    fpsText.innerHTML = 'FPS';

    fpsDiv.appendChild( fpsText );

    var fpsGraph = document.createElement( 'div' );

    fpsGraph.id = 'fpsGraph';

    fpsGraph.style.cssText = 'position:relative;width:74px;height:30px;background-color:#0ff';

    fpsDiv.appendChild( fpsGraph );

    while ( fpsGraph.children.length <  ) {

        var bar = document.createElement( 'span' );

        bar.style.cssText = 'width:1px;height:30px;float:left;background-color:#113';

        fpsGraph.appendChild( bar );

    }

    var msDiv = document.createElement( 'div' );

    msDiv.id = 'ms';

    msDiv.style.cssText = 'padding:0 0 3px 3px;text-align:left;background-color:#020;display:none';

    container.appendChild( msDiv );

    var msText = document.createElement( 'div' );

    msText.id = 'msText';

    msText.style.cssText = 'color:#0f0;font-family:Helvetica,Arial,sans-serif;font-size:9px;font-weight:bold;line-height:15px';

    msText.innerHTML = 'MS';

    msDiv.appendChild( msText );

    var msGraph = document.createElement( 'div' );

    msGraph.id = 'msGraph';

    msGraph.style.cssText = 'position:relative;width:74px;height:30px;background-color:#0f0';

    msDiv.appendChild( msGraph );

    while ( msGraph.children.length <  ) {

        var bar = document.createElement( 'span' );

        bar.style.cssText = 'width:1px;height:30px;float:left;background-color:#131';

        msGraph.appendChild( bar );

    }

    var setMode = function ( value ) {

        mode = value;

        switch ( mode ) {

            case :

                fpsDiv.style.display = 'block';

                msDiv.style.display = 'none';

                break;

            case :

                fpsDiv.style.display = 'none';

                msDiv.style.display = 'block';

                break;

        }

    }

    var updateGraph = function ( dom, value ) {

        var child = dom.appendChild( dom.firstChild );

        child.style.height = value + 'px';

    }

    return {

        REVISION: ,

        domElement: container,

        setMode: setMode,

        begin: function () {

            startTime = Date.now();

        },

        end: function () {

            var time = Date.now();

            ms = time - startTime;

            msMin = Math.min( msMin, ms );

            msMax = Math.max( msMax, ms );

            msText.textContent = ms + ' MS (' + msMin + '-' + msMax + ')';

            updateGraph( msGraph, Math.min( ,  - ( ms /  ) *  ) );

            frames ++;

            if ( time > prevTime +  ) {

                fps = Math.round( ( frames *  ) / ( time - prevTime ) );

                fpsMin = Math.min( fpsMin, fps );

                fpsMax = Math.max( fpsMax, fps );

                fpsText.textContent = fps + ' FPS (' + fpsMin + '-' + fpsMax + ')';

                updateGraph( fpsGraph, Math.min( ,  - ( fps /  ) *  ) );

                prevTime = time;

                frames = ;

            }

            return time;

        },

        update: function () {

            startTime = this.end();

        }

    }

};

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stats.js随时查看fps

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