1、动态加载js || css || style

const loadRes =  function(name, type, fn) {
    let ref;
    if (type === 'js') {
        ref = document.createElement('script');
        ref.setAttrbute('type', 'text/javascript');
        ref.setAttrbute('src', name);
    } else if (type === 'css') {
        ref = document.createElement('link');
        ref.setAttrbute('rel', 'stylesheet');
        ref.setAttrbute('type', 'text/css');
        ref.setAttrbute('href', name);
    } else if (type === 'style') {
        ref = document.createElement('style');
        ref.innerhtml = name;
    }
    if (typeog ref !== 'undefined') {
        document.getElementsByTagName('head')[0].appendChild(ref);
        ref.onload = function() {
            typeof fn === 'function' && fn()
        }
    }
}

2、获取url参数

const getUrlParams = function(name) {
    let reg = new RegExp('(^|&?)' + name + '=([^&]*)(&|$)', 'i');
    let r = window.location.href.substr(1).match(ref);
    if (r != null) {
        return decodeURI(r[2]);
    }
    return undefined;
}

3、本地存储

const store = {
    set: function(name, value, exp) {
        let d = new Date();
        let time = 0;
        exp = (typeof(exp) === 'undefined' || !exp) ? 1: exp;
        time = d.setHours(d.getHours() + (24 * exp));
        localStorage.setItem(name, JSON.stringfy({data: value, time: time}));
    },
    get: function(name) {
        let data = localStorage.getItem(name);
        if (!data) {
            return null;
        }
        let obj = JSON.parse(data);
        if (new Date().getTime() > obj.time) {
            localStorage.removeItem(name);
            return null;
        } else {
            return obj.data;
        }
    },
    clear: function(name) {
        if (name) {
            localStorage.removeItem(name);
        } else {
            localStorage.clear();
        }
    }
}