自己空闲的时候封装一下

var test = (function(){
    var self = {};
    self.alert = function(){
        
        console.log('this is alert')
    }
    //sleep
    self.sleep = function(){},
    self.extendJson = function(){},
    self.formatParams = function(){},
    self.httpAgent = function(){},
    self.randomChar = function(){},
    self.getCharLen = function(){},
    self.subStr = function(){},
    self.getPara = function(){},
    self.subTime = function(){},//计算时间差，返回毫秒数
    self.getUnixTime = function(){},//获取unix时间
    self.formatTime = function(){},//时间格式化
    self.getCookie = function(){},//获取cookie
    self.setCookie = function(){},//设置cookis
    self.getMeta = function(key){//获取meta标签内容
        return document.querySelector('meta[name="'+key+']').getAttribute('content');
    },
    self.setMeta = function(key,des){//设置meta内容
        document.querySelector('meta[name="'+key+']').setAttribute('content','des');
    },
    self.setMetaKey = function(des){
        document.querySelector('meta[name="keywords"]').setAttribute('content',des.replace(/"/g,'”'));
    },
    self.setMetaDes = function(des){
        document.querySelector('meta[name="description"]').setAttribute('content',des.replace(/"/g,'”'));
    },
    self.setSeo = function(title,keywords,des){
        document.title = title+'-'+document.title;
        self.setMetaKey(keywords);
        self.setMetaDes(des);
    }
    return self;
}())