var interval = setInterval(function () { // 秒数  

var second = totalSecond;

// 天数位  

var day = Math.floor(second / 3600 / 24);

var dayStr = day.toString();

if (dayStr.length == 1) dayStr = '0' + dayStr;

// 小时位  

var hr = Math.floor((second - day * 3600 * 24) / 3600);

var hrStr = hr.toString();

if (hrStr.length == 1) hrStr = '0' + hrStr;

// 分钟位  

var min = Math.floor((second - day * 3600 * 24 - hr * 3600) / 60);

var minStr = min.toString();

if (minStr.length == 1) minStr = '0' + minStr;

// 秒位  

var sec = second - day * 3600 * 24 - hr * 3600 - min * 60;

var secStr = sec.toString();

if (secStr.length == 1) secStr = '0' + secStr;

that.setData({

liveday: dayStr,

livehours: hrStr,

livesecond: secStr,

liveminute: minStr,

});

totalSecond--;

//用于判断是否显示天数

if (day == 0) {

that.setData({

Downday: false,

Downsecond: true

})

} else {

that.setData({

Downday: true,

Downsecond: false

})

}

}.bind(this), 1000);