A detailed introduction to JS tool class, how to operate cookies

What are the JS tool operations? The following introduces the complete code and implementation principle of operating the Cookie tool class. Rewrite the Cookie tool class, which can be introduced in edit.jsp and used directly in other imported js.

/***
	*读取指定的Cookie值 readCookie("id");
	*@param {string} cookieName Cookie名称
	*/
	function readCookie(cookieName) {
	    var theCookie = "" + document.cookie;
	    var ind = theCookie.indexOf(cookieName);
	    if(ind==-1 || cookieName=="") return "";
	    var ind1 = theCookie.indexOf(';',ind);
	    if(ind1==-1) ind1 = theCookie.length;
	    /*读取Cookie值*/
	    return unescape(theCookie.substring(ind+cookieName.length+1,ind1));
	}
	
	/***
	* 设置Cookie值 setCookie("id",1);
	* @param {string} cookieName Cookie名称
	* @param {string} cookieValue Cookie值
	* @param {number} nDays Cookie过期天数
	*/
	function setCookie(cookieName, cookieValue) {
	    /*当前日期*/
	    var today = new Date();
	    /*Cookie过期时间*/
	    var expire = new Date();
	    /*如果未设置nDays参数或者nDays为0，取默认值1*/
	    //if(nDays == null || nDays == 0) nDays = 1;
	    /*计算Cookie过期时间【 3600000 * 24  为一天】*/
	    expire.setTime(today.getTime() + 400000); //5分钟
	    document.cookie = cookieName + "=" + escape(cookieValue) + ";expires=" +      expire.toGMTString();
	}
	
	/***
	* 删除cookie中指定变量函数  
	* @param {string} $name Cookie名称
	*/    
    function deleteCookie($name){    
         var myDate=new Date();    
         myDate.setTime(-1000);//设置时间    
         document.cookie=$name+"=''; expires="+myDate.toGMTString();                
    }
	
	/***
	* 删除cookie中所有定变量函数  
	* @param {string} cookieName Cookie名称
	* @param {string} cookieValue Cookie值
	* @param {number} nDays Cookie过期天数
	*/  
    function clearCookie(){    
         var myDate=new Date();    
         myDate.setTime(-1000);//设置时间    
         var data=document.cookie;    
         var dataArray=data.split("; ");    
         for(var i=0;i<dataArray.length;i++){    
              var varName=dataArray[i].split("=");    
              document.cookie=varName[0]+"=&#39;&#39;; expires="+myDate.toGMTString();    
         }    
    }

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