Js常用方法

2019.2.5 星期三 16:35

/**
 * Cookie
 */
function getCookie(name){
    var reg=new RegExp("(^| )"+name+"=([^;]*)(;|$)")
    var arr=document.cookie.match(reg)
    return (arr?arr[2]:null)
} 
// 设置存储数据
function setStorage(key, val, cookie, day){
    var cookie = key + "=" + encodeURIComponent(val),
        days = (typeof(day) == 'undefined' || day == 0) ? 3650 : day,// 过期时间，默认10年
        exp = new Date();
    exp.setTime(exp.getTime() + days * 24 * 60 * 60 * 1000);
    cookie = cookie + ";domain=" + cookieDomain + ";path=/;expires=" + exp.toGMTString();
    document.cookie = cookie;
}
// 删除存储数据
function delStorage(key, cookie){
    if($.trim(key)){
        var exp = new Date(),
            cval = getStorage(key, 'cookie');
        exp.setTime(exp.getTime() - 1);
        if(cval != null){
            document.cookie = key + "=" + cval + ";domain=" + cookieDomain + ";path=/;expires=" + exp.toGMTString();
        }
    }
}
// 清除存储数据
function clearStorage(cookie){
    var key = document.cookie.match(/[^ =;]+(?=\=)/g);
    if(key){
        for(var i = key.length - 1; i >= 0; i--){
            var exp = new Date(),
                cval = getStorage(key[i], 'cookie');
            exp.setTime(exp.getTime() - 1);
            document.cookie = key[i] + "=" + cval + ";domain=" + cookieDomain + ";path=/;expires=" + exp.toGMTString();
        }
    }
}


/**
 * 函数节流/去抖
 */
function debounce(fn, wait) {
    var timer = null;
    return function () {
        var context = this
        var args = arguments
        if (timer) {
            clearTimeout(timer);
            timer = null;
        }
        timer = setTimeout(function () {
            fn.apply(context, args)
        }, wait)
    }
}
function throttle(fn, wait) {
    var previous = 0
    var timer = null
    return function () {
        var context = this
        var args = arguments
        if (!previous) {
            previous = Date.now()
            fn.apply(context, args)
        } else if (previous + wait >= Date.now()) {
            if (timer) {
                // console.log(timer)
                clearTimeout(timer)
                timer = null
            }
            // console.log(timer)
            timer = setTimeout(function () {
                // console.log(timer)
                previous = Date.now()
                fn.apply(context, args)
            }, wait)
        } else {
            previous = Date.now()
            fn.apply(context, args)
        }
    }
}