前端开发常用代码片段（下篇）

//验证邮箱

/^\w+@([0-9a-zA-Z]+[.])+[a-z]{2,4}$/

 
//验证手机号

/^1[3|5|8|7]\d{9}$/


//验证URL

/^http:\/\/.+\./


//验证身份证号码

/(^\d{15}$)|(^\d{17}([0-9]|X|x)$)/


//匹配字母、数字、中文字符

/^([A-Za-z0-9]|[\u4e00-\u9fa5])*$/


//匹配中文字符

/[\u4e00-\u9fa5]/


//匹配双字节字符(包括汉字)

/[^\x00-\xff]/

<input id="txt" type="text">

//字符串截取

function getByteVal(val, max) {

    var returnValue = '';

    var byteValLen = 0;

    for (var i = 0; i < val.length; i++) { if (val[i].match(/[^\x00-\xff]/ig) != null)byteValLen += 2; else byteValLen += 1; if (byteValLen > max) break;

        returnValue += val[i];

    }

    return returnValue;

}

$('#txt').on('keyup', function () {

    var val = this.value;

    if (val.replace(/[^\x00-\xff]/g, "**").length > 14) {

        this.value = getByteVal(val, 14);

    }

});

<input id="send" type="button" value="发送验证码">

var times = 60, // 时间设置60秒

 timer = null;

document.getElementById('send').onclick = function () {

 // 计时开始

 timer = setInterval(function () {

 times--;

 if (times <= 0) {

 send.value = '发送验证码';

 clearInterval(timer);

 send.disabled = false;

 times = 60;

 } else {

 send.value = times + '秒后重试';

 send.disabled = true;

 }

 }, 1000);

}

var times = 60,

    timer = null;

$('#send').on('click', function () {

    var $this = $(this);

    // 计时开始

    timer = setInterval(function () {

        times--;

        if (times <= 0) {

            $this.val('发送验证码');

            clearInterval(timer);

            $this.attr('disabled', false);

            times = 60;

        } else {

            $this.val(times + '秒后重试');

            $this.attr('disabled', true);

        }

    }, 1000);

});

<div id="showtimes"></div>

// 设置倒计时秒数  

var t = 10;  

// 显示倒计时秒数  

function showTime(){  

    t -= 1;  

    document.getElementById('showtimes').innerHTML= t;  

    if(t==0){  

        location.href='error404.asp';  

    }  

    //每秒执行一次 showTime()  

    setTimeout("showTime()",1000);  

}  

showTime();

function formatDate(now) {

    var y = now.getFullYear();

    var m = now.getMonth() + 1; // 注意 JavaScript 月份+1

    var d = now.getDate();

    var h = now.getHours();

    var m = now.getMinutes();

    var s = now.getSeconds();

    return y + "-" + m + "-" + d + " " + h + ":" + m + ":" + s;

}

var nowDate = new Date(1442978789184);

alert(formatDate(nowDate));

var calculateDate = function(){

    var date = new Date();

    var weeks = ["日","一","二","三","四","五","六"];

    return date.getFullYear()+"年"+(date.getMonth()+1)+"月"+

    date.getDate()+"日 星期"+weeks[date.getDay()];

}

$(function(){

    $("#dateSpan").html(calculateDate());

});

<p id="text"></p>

function time(y,m){

    var tempTime = new Date(y,m,0);

    var time = new Date();

    var saturday = new Array();

    var sunday = new Array();

    for(var i=1;i<=tempTime.getDate();i++){

        time.setFullYear(y,m-1,i);

        var day = time.getDay();

        if(day == 6){

            saturday.push(i);

        }else if(day == 0){

            sunday.push(i);

        }

    }

    var text = y+"年"+m+"月份"+"<br />"

                +"周六："+saturday.toString()+"<br />"

                +"周日："+sunday.toString();

    document.getElementById("text").innerHTML = text;

}

time(2018,5);

$(document).ajaxError(function (e,xhr,settings,error){
　　console.log(error);
})

$('#elem').show();
$('#elem').html('bla');
$('#elem').otherStuff();

$('#elem').show().html('bla').otherStuff();

var $elem = $('#elem');
$elem.show();
$elem.html('bla');
$elem.otherStuff();