React Native (中间值)(中间值) .bind不是函数

Question

你能告诉我为什么会出现这个错误吗？我正在尝试在React Native中进行日期倒计时，但我无法在状态中进行倒计时更新。提前谢谢。

代码如下：

componentDidMount(){


    var end = new Date(theDate);
    console.log("end " + end);
    var _second = 1000;
var _minute = _second * 60;
    var _hour = _minute * 60;
    var _day = _hour * 24;
    var timer;

    function showRemaining() {
    var now = new Date();
    console.log("End is: " + end);
    console.log("Now is: " + now);
    var distance = end - now;

    console.log("Distance is: " + distance)

     if (distance < 0) {

              clearInterval(timer);
             console.log('EXPIRED!');
      }

    var days = Math.floor(distance / _day);

    var hours = Math.floor((distance % _day) / _hour);
    var minutes = Math.floor((distance % _hour) / _minute);
    var seconds = Math.floor((distance % _minute) / _second);

    this.setState({
        days: days,
        hours: hours,
        minutes: minutes,
        seconds: seconds
    }.bind(this));

    console.log("Remaining: " + days + ' days ' + hours + 'hrs '+ minutes + 'mins ' + seconds + ' secs')
}

timer = setInterval(showRemaining, 1000);

}

Answer 1

只有一个地方可以调用.bind：

this.setState({
    days: days,
    hours: hours,
    minutes: minutes,
    seconds: seconds
}.bind(this));

对象没有.bind方法only functions do。不确定您在这里尝试使用.bind来实现什么。去掉它就行了。