var count= 0;
var timerBig,Ttimer;
functionautoPlay () {
timerBig= setInterval(function() {
count++;
var c = 1000; //每次偏移的left
var d = 10; //段数
var t = 0; //存储当前步数
var b= content.offsetLeft;//获取当前left值
Ttimer= setInterval(function () {
t++;
content.style.left= b- c/ d* t+ "px";
if (t>=d) {
//清除计时器
clearInterval(Ttimer);
//循环
if(count>=4){
content.style.left= 0;
count= 0;
}
//切换span的背景
for (var i= 0; i< spans.length; i++) {
if (count== i) {
spans[i].className= "select"
} else{
spans[i].className= "unselect"
}
}
}
},50)
},2000);
}
