// -防抖
export function debounce(fn, wait) {
    let delay = wait || 500
    let timer
    return function () {
        let args = arguments;
        if (timer) {
            clearTimeout(timer)
            console.log('拦截')
        }
        let callNow = !timer
        timer = setTimeout(() => {
            console.log('发送')
            timer = null
        }, delay)
        if (callNow) fn.apply(this, args)
    }
}

// -节流
export function throttle(fn, wait) {
    let delay = wait || 500
    let timer = null
    return function () {
        if (timer) {
            console.log('拦截');
            return
        }
        timer = setTimeout(() => {
            console.log('发送');
            fn.apply(this, arguments)
            timer = null
        }, delay)
    }
}

// 截取参数
export default function getPageParams() {
    //取得查询字符串并去掉开头的问号
    var qs = location.href.split('?')[1] || '',
        //保存数据的对象
        args = {},
        //取得每一项
        items = qs.length ? qs.split("&") : [],
        item = null,
        name = null,
        value = null,
        //在for 循环中使用
        i = 0,
        len = items.length;
    console.log('qs', qs)
    //逐个将每一项添加到args 对象中
    for (i = 0; i < len; i++) {
        item = items[i].split("=");
        name = decodeURIComponent(item[0]);
        value = decodeURIComponent(item[1]);
        if (name.length) {
            args[name] = value;
        }
    }
    return args;
}

//格式化日期
export function dateFormat(format, date) {
    if (!format) return '';
    date = date || new Date();
    let dateMap = {
        y: date.getFullYear(),
        M: date.getMonth() + 1,
        d: date.getDate(),
        h: date.getHours(),
        m: date.getMinutes(),
        s: date.getSeconds(),
        S: date.getMilliseconds()
    };
    return format.replace(/(y+)|(M+)|(d+)|(h+)|(m+)|(s+)|(S+)/g, (a) => _add0(dateMap[a[0]], a.length))
}
 
function _add0(time, len) {
    time = time.toString();
    let l = time.length;
    return l < len ? '0'.repeat(len - l) + time : time;
}