vueタイマーsetIntervalの使用

  ：https://www.jianshu.com/p/180957762852   

beforeMount() {
    //         ， 3     
    var self = this;
    clearInterval(timer);
    let timer = setInterval(_getCarPeopleStreamByEntraceBottom, 3000)

    function _getCarPeopleStreamByEntraceBottom() {
        //         
        let totelNumber = new Array(8);
        for (let i = 0; i < totelNumber.length; i++) {
            totelNumber[i] = Math.ceil(Math.random() * 10) - 1
        };

        let data = {
            carInNumber: totelNumber[0],
            carOutNumber: totelNumber[1]
        };
        self.southPassagewayData = data;
    }
    _getCarPeopleStreamByEntraceBottom();
},