js常见方法封装

1、判断是否是微信浏览器

function isWechat() {
    var ua = navigator.userAgent.toLowerCase();
    if (ua.match(/MicroMessenger/i) == 'micromessenger') {
        return true;
    } else {
        return false;
    }
}

2、判断是否是PC/WAP端

function isPC() {
    var userAgentInfo = navigator.userAgent;
    var Agents = ['Android', 'iPhone', 'SymbianOS', 'Windows Phone', 'iPad', 'iPod'];
    var flag = true;
    for (var v = 0; v < Agents.length; v++) {
        if (userAgentInfo.indexOf(Agents[v]) > 0) {
            flag = false;
            break;
        }
    }
    return flag;
}

3、获取URL参数

function getUrlParam(name, url) {
    if (!url) url = location.href;
    if (url.indexOf('?') == -1) return '';
    try {
        var re = new RegExp("" + name + "=([^&?]*)", "ig");
        return ((url.match(re)) ? (decodeURIComponent(url.match(re)[0].substr(name.length + 1))) : '');
    } catch (_e) {
        return '';
    }
}

4、获取cookie

function getCookie(name, defaultVal = null) {
    var arr,
    reg = new RegExp('(^| )' + name + '=([^;]*)(;|$)');
    if (arr = document.cookie.match(reg)) {
        return unescape(arr[2]);
    } else {
        return defaultVal;
    }
}

5、设置cookie

function setCookie(name, value, seconds) {
    var expires = new Date();
    expires.setTime(expires.getTime() + parseInt(seconds) * 1000);
    var domain = document.domain;
    var domainArr = domain.split('.');
    if (domainArr.length >= 3) {
        domainArr.shift();
        domain = domainArr.join('.');
    }    
    document.cookie = escape(name) + '=' + escape(value) + (seconds ? ('; expires=' + expires.toGMTString()) : "") + '; path=/; domain=.' + domain + ';';
}

6、删除cookie

// this指上面的方法
function delCookie(name) {
    this.setCookie(name, '', -1);
}