关于微信上使用 requestAnimationFrame

2016-5-17 17:13:35-

在浏览器流畅运行的代码，在微信打开竟然卡到爆炸，十分不流畅

即使已经封装好了

(function() {
	    var lastTime = 0;
	    var vendors = ['webkit', 'moz'];
	    for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
	        window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
	        window.cancelAnimationFrame = window[vendors[x] + 'CancelAnimationFrame'] ||    // Webkit中此取消方法的名字变了
	                                      window[vendors[x] + 'CancelRequestAnimationFrame'];
	    }

	    if (!window.requestAnimationFrame) {
	        window.requestAnimationFrame = function(callback, element) {
	            var currTime = new Date().getTime();
	            var timeToCall = Math.max(0, 16.7 - (currTime - lastTime));
	            var id = window.setTimeout(function() {
	                callback(currTime + timeToCall);
	            }, timeToCall);
	            lastTime = currTime + timeToCall;
	            return id;
	        };
	    }
	    if (!window.cancelAnimationFrame) {
	        window.cancelAnimationFrame = function(id) {
	            clearTimeout(id);
	        };
	    }
	}());

出现该问题的代码，持续找原因ing

/*
*/
$("#start").click(function() {
		
		 var start = 0, during = 100;
		var _run = function() {
			start++;
			var the_top = Tween.Quad.easeOut(start, ball.x , -600, during);
	        $("#ball1").css({"top":the_top});
	        
	        if(start < during)requestAnimationFrame(_run);
	    };
	    _run();
	})