常用的js小功能

js 常用小功能

//必须为数字
function checknum(varStr) { 
	var flag = "ok";
	if (isNaN(varStr)){
		flag = "error";
	} 
	return flag;	
}

//必须为数字和字母
function checkNumEng(varStr){
	var flag = "ok";
	 if(varStr.match(/[^A-Za-z0-9]/ig)){
		 flag = "error";
	 }
	 return flag;
}

// 数值必须大于0 
function greaterThan(varStr){
	var flag ="ok";
	if(parseFloat(varStr)<=0){
		flag ="error";
	}
	return flag;
}

/**
 * 获取当前时间 yyyy-MM-dd HH:mm:ss
 */
function getNowFormatDate() {
    var date = new Date();
    var seperator1 = "-";
    var seperator2 = ":";
    var month = date.getMonth() + 1;
    var strDate = date.getDate();
    if (month >= 1 && month <= 9) {
        month = "0" + month;
    }
    if (strDate >= 0 && strDate <= 9) {
        strDate = "0" + strDate;
    }
    var currentdate = date.getFullYear() + seperator1 + month + seperator1 + strDate
            + " " + date.getHours() + seperator2 + date.getMinutes()
            + seperator2 + date.getSeconds();
    return currentdate;
}