小程序动画-循环放大缩小的动画（一闪一闪的）

var circleCount = 0;
// 心跳的外框动画
this.animationMiddleHeaderItem = wx.createAnimation({
duration:1000,    // 以毫秒为单位
timingFunction: 'linear',
delay: 100,
transformOrigin: '50% 50%',
success: function (res) {
}
});
setInterval(function() {
if (circleCount % 2 == 0) {
this.animationMiddleHeaderItem.scale(1.15).step();
} else {
this.animationMiddleHeaderItem.scale(1.0).step();
}

this.setData({
animationMiddleHeaderItem: this.animationMiddleHeaderItem.export()  //输出动画
});

circleCount++;
if (circleCount == 1000) {
circleCount = 0;
}
}.bind(this), 1000);