Question

我正在尝试执行一个返回weekNumber的函数，并且在最后一行显示错误， “算术运算的左右手必须输入任何数字或枚举”

有什么解决办法吗？

weekNumber(d: Date) {
d = new Date(Date.UTC(d.getFullYear(), d.getMonth(), d.getDate()));
    // set thursday: current date + 4 - current day
    // make sunday number 7
    d.setUTCDate(d.getUTCDate() + 4 - (d.getUTCDay() || 7));
    // first day of year
    const firstDayOfYear = new Date(Date.UTC(d.getFullYear(), 0 , 1 ));
    const  yearStart = new Date(Date.UTC(d.getUTCFullYear(), 0 , 1 ));
    firstDayOfYear.getFullYear();
    // calculate full weeks to nearest thrusday
    const weekNo = Math.ceil(( ((d - yearStart) / 86400000) + 1) / 7);
}

Answer 1

您可以使用any解决此问题

weekNumber(d: any) {
        d = new Date(Date.UTC(d.getFullYear(), d.getMonth(), d.getDate()));
        // set thursday: current date + 4 - current day
        // make sunday number 7
        d.setUTCDate(d.getUTCDate() + 4 - (d.getUTCDay() || 7));
        // first day of year
        const firstDayOfYear = new Date(Date.UTC(d.getFullYear(), 0, 1));
        const yearStart = <any>new Date(Date.UTC(d.getUTCFullYear(), 0, 1));
        firstDayOfYear.getFullYear();
        // calculate full weeks to nearest thrusday
        const weekNo = Math.ceil((((d - yearStart) / 86400000) + 1) / 7);
}

或其他解决方案

您可以使用moment解决此问题

安装moment库

npm install moment --save

import moment from 'moment';
export class AppComponent {
    weekNumber(d: Date) {
        const weekNo = moment(d).week()
    }
}

在Angular中减去2个日期

1 个答案: