bjtu_order/bjtu_app/dist/helpers/debounce.js

export default function debounce(func, wait, immediate) {
    let timeout
    let args
    let context
    let timestamp
    let result

    const later = function later() {
    const last = +(new Date()) - timestamp

    if (last < wait && last >= 0) {
            timeout = setTimeout(later, wait - last)
        } else {
            timeout = null
            if (!immediate) {
                result = func.apply(context, args)
                if (!timeout) {
                    context = null
                    args = null
                }
            }
        }
    }

    return function debounced() {
        context = this
        args = arguments
        timestamp = +(new Date())

        const callNow = immediate && !timeout
        if (!timeout) {
            timeout = setTimeout(later, wait)
        }

        if (callNow) {
            result = func.apply(context, args)
            context = null
            args = null
        }

        return result
    }
}