Question

我遇到的问题是我无法弄清楚如何使动画条同步到现在我看起来很好，但是当我将值'43'更改为'100'时，百分比计数器会变慢。

示例代码：

$(document).ready(function(){
                $(".barInner").animate({
                    width: 43 + "%",
                    opacity: 1
                }, 2500 );

                var display = $('.barInner');
                var currentValue = 0;
                var nextValue    = 43;

                var diff         = nextValue - currentValue;
                var step         = ( 0 < diff ? 1 : -1 ); 

                for (var i = 0; i < Math.abs(diff); ++i) {
                    setTimeout(function() {
                        currentValue += step
                        display.text(currentValue + "%");
                    }, 54 * i)   
                }
            });

http://jsfiddle.net/vTKw7/

提前致谢，

尼克

Answer 1

您无法以您希望的方式同步.animate()和setTimeout()。尝试使用setTimeout控制进度条的宽度并同时显示百分比数字。

        $(document).ready(function () {

            var display = $('.barInner');
            var currentValue = 0;
            var nextValue = 100;
            var diff = nextValue - currentValue;
            var step = (0 < diff ? 1 : -1);

            for (var i = 0; i < Math.abs(diff); ++i) {
                setTimeout(function () {
                    currentValue += step;
                    display.text(currentValue + "%");
                    $(".barInner").css({
                        width: currentValue + "%",
                        opacity: 1
                    });
                }, 54 * i)
            }
        });

http://jsfiddle.net/mblase75/6TMWm/

或者，使用.stop().animate()来平滑一点：

                    $(".barInner").stop().animate({
                        width: currentValue + "%",
                        opacity: 1
                    },50);

http://jsfiddle.net/mblase75/6TMWm/1/

使javascript动画条同步到动画百分比

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