运动框架加入缓冲 

<!DOCTYPE html>
<html>

    <head>
        <meta charset="UTF-8">
        <title></title>
        <style>
            #div1 {
                width: 100px;
                height: 100px;
                background: red;
                position: absolute;
                left: 400px;
                top: 100px;
            }
        </style>
        <script type="text/javascript">
            window.onload = function() {

                var oDiv1 = document.getElementById("div1");

                oDiv1.onclick = function() {
                    
//                    startMove(this, {
//                        width: 200
//                    }, function(){
//                        startMove(this,{
//                            height: 200
//                        });
//                    });
                    
                    startMove(this, {
                        width: 200,
                        height: 200
                    });
                    

                }

                function startMove(obj, json,fn) {
                    clearInterval(obj.iTimer);
                    var iCur = 0;
                    var iSpeed=0;
                    obj.iTimer = setInterval(function() {
                        
                        var iBtn=true;

                        for(var attr in json) {
                            var iTarget = json[attr];
                            if(attr == "opacity") {
                                iCur = Math.round(css(obj, "opacity") * 100);
                            } else {
                                iCur = parseInt(css(obj, attr));
                            }
                            
                            iSpeed = (iTarget - iCur) / 8;
                            
                            iSpeed = iSpeed > 0 ? Math.ceil(iSpeed) : Math.floor(iSpeed);

                            if(iCur != iTarget) {
                                iBtn=false;
                                if(attr == "opacity") {
                                    obj.style.opacity = (iCur + iSpeed) / 100;
                                    obj.style.filter = 'alpha(opacity=' + (iCur + iSpeed) + ')';
                                } else {
                                    obj.style[attr] = iCur + iSpeed + 'px';
                                }
                            } 

                        }
                        if(iBtn){
                            clearInterval(obj.iTimer);
                            fn && fn.call(obj);
                        }

                    }, 30);
                }

                function css(obj, attr) {
                    if(obj.currentStyle) {
                        return obj.currentStyle[attr];
                    } else {
                        return getComputedStyle(obj, false)[attr];
                    }
                }

            }
        </script>
    </head>

    <body>
        <div id="div1"></div>
    </body>

</html>

 

posted @ 2019-01-03 16:18  webxy  阅读(82)  评论(0)  编辑  收藏  举报