wux-weapp/src/helpers/debounce.js

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