工作中常用js功能汇总

var isclick= true;
function click(){
 if(isclick){
  isclick = false;
  //狼蚁网站SEO优化添加需要执行的事件
  ...
 }

var isclick= true;
function click(){
 if(isclick){
  isclick= false;
  //狼蚁网站SEO优化添加需要执行的事件
   ...

  //定时器
  setTimeout(function(){
   isclick = true;
  }, 500);
 }

 var time = 60;
//倒计时
function getRandomCode() {
 if (time === 0) {
  time = 60;
  return;
 } else {
  time--;
  $('#time i').text(time);
 }
 setTimeout(function() {
  getRandomCode();
 },1000);

var timeClock;
function sendCode() {
 var timer_num = 60;
 timeClock=setInterval(function(){
  timer_num--;
  $('.clock').html(timer_num);

  if (timer_num == 0) {
   clearInterval(timeClock);
   $('.clock').html(60);
  }
 },1000)

function getQueryString(name) {
 var reg = new RegExp('(^|&)' + name + '=([^&]*)(&|$)', 'i');
 var r = window.location.search.substr(1).match(reg);
 if (r != null) {
  return decodeURI(r[2]);
 }
 return null;
}
//调用方法
GetQueryString("参数名")

function getFromData(id) {
 if (id == undefined) {
  id = "form"
 }
 var data = {};
 var t = $(id).serializeArray();
 $.each(t, function() {
  data[name = this.name] = this.value;
 });
 return data;
}

var userData. = getFromData();
userData.表单name值 //获取值

// 设置cookies

function setCookie(name, value) {
 var exp = new Date();
 exp.setTime(exp.getTime() + 60 * 60 * 1000);
 document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString() + ";path=/";
}

//读取cookies
function getCookie(name) {
 var arr, reg = new RegExp("(^| )" + name + "=([^;]*)(;|$)");

 if (arr = document.cookie.match(reg))

  return unescape(arr[2]);
 else
  return null;
}

// 清楚所有cookies
function clearCookie() {
 var keys = document.cookie.match(/[^ =;]+(?=\=)/g);
 if (keys) {
  for (var i = keys.length; i--;) {
   document.cookie = keys[i] + '=0;path=/;expires=' + new Date(0).toUTCString(); //清除当前域名下的,例如：m.kevis.com
   document.cookie = keys[i] + '=0;path=/;domain=' + document.domain + ';expires=' + new Date(0).toUTCString(); //清除当前域名下的，例如 .m.kevis.com
   document.cookie = keys[i] + '=0;path=/;domain=kevis.com;expires=' + new Date(0).toUTCString(); //清除一级域名下的或指定的，例如 .kevis.com
  }
 }
}

//时间戳转换方法 date:时间戳数字
function formatDate(date) {
 var date = new Date(date);
 var YY = date.getFullYear() + '-';
 var MM = (date.getMonth() + 1 < 10 ? '0' + (date.getMonth() + 1) : date.getMonth() + 1) + '-';
 var DD = (date.getDate() < 10 ? '0' + (date.getDate()) : date.getDate());
 var hh = (date.getHours() < 10 ? '0' + date.getHours() : date.getHours()) + ':';
 var mm = (date.getMinutes() < 10 ? '0' + date.getMinutes() : date.getMinutes()) + ':';
 var ss = (date.getSeconds() < 10 ? '0' + date.getSeconds() : date.getSeconds());
 return YY + MM + DD +" "+hh + mm + ss;
}

// 保存成png格式的图片
 document.getElementById("save").onclick = function () {
  var canvas = document.getElementById("canvas");
  if (window.navigator.msSaveOrOpenBlob) {//ie浏览器
   var imgData = canvas.msToBlob();
   var blobObj = new Blob([imgData]);
   window.navigator.msSaveOrOpenBlob(blobObj, "专家认证二维码.png");
  } else {//谷歌火狐浏览器
   downLoad(canvas.toDataURL("image/png"));
  }
 }

 // 下载图片
 function downLoad(url) {
  var oA = document.createElement("a");
  oA.download = '专家认证二维码';// 设置下载的文件名，默认是'下载'
  oA.href = url;
  oA.className = "qrcode"
  document.body.appendChild(oA);
  oA.click();
  oA.remove(); // 下载之后把创建的元素删除
 }

<input type="text" placeholder="请输入" oninput = "checkInput(this)">

 function checkInput(obj) {
  var t = obj.value.charAt(0);
  obj.value = obj.value.replace(/[^\d.]/g, ""); //清除"数字"和"."以外的字符
  obj.value = obj.value.replace(/^[0]+[0-9]*$/gi, ""); //第一位数字不能为0
  obj.value = obj.value.replace(/^\./g, ""); //验证第一个字符是数字而不是.
  obj.value = obj.value.replace(/\.{2,}/g, "."); //只保留第一个. 清除多余的
  obj.value = obj.value.replace(".", "$#$").replace(/\./g, "").replace("$#$", ".");
  obj.value = obj.value.replace(/^(\-)*(\d+)\.(\d\d).*$/,'$1$2.$3'); //只能输入两个小数
  if (t == '-') {
   obj.value = '-' + obj.value;
  }
 }

 //s是数字，n是小数点位数
 function fmoney(s, n) {
 n = n > 0 && n <= 20 ? n : 2;
 s = parseFloat((s + "").replace(/[^\d\.-]/g, "")).toFixed(n) + "";
 var l = s.split(".")[0].split("").reverse(),
 r = s.split(".")[1];
 t = "";
 for (i = 0; i < l.length; i++) {
  t += l[i] + ((i + 1) % 3 == 0 && (i + 1) != l.length ? "," : "");
 }
 return t.split("").reverse().join("") + "." + r;
}

function moneyToNumValue(val) {
 var num = val.trim();
 var ss = num.toString();
 if (ss.length == 0) {
  return "0";
 }
 return ss.replace(/,/g, "");
}

 var canvas = document.getElementById("canvas");
 var imageData = canvas.getContext("2d").getImageData(0, 0, canvas.width, canvas.height);
  for (var i = 0; i < imageData.data.length; i += 4) {
   // 当该像素是透明的，则设置成白色
   if (imageData.data[i + 3] == 0) {
    imageData.data[i] = 255;
    imageData.data[i + 1] = 255;
    imageData.data[i + 2] = 255;
    imageData.data[i + 3] = 255;
   }
  }
  canvas.getContext("2d").putImageData(imageData, 0, 0);
  var img = canvas.toDataURL("image/jpeg");
  img = img.substring(img.indexOf(',') + 1);
  for (var i = 0; i < imageData.data.length; i += 4) {
   // 当该像素是白色的，则设置成透明
   if (imageData.data[i] == 255) {
    imageData.data[i] = 0;
    imageData.data[i + 1] = 0;
    imageData.data[i + 2] = 0;
    imageData.data[i + 3] = 0;
   }
  }
  canvas.getContext("2d").putImageData(imageData, 0, 0);

//手机号正则
var reg = /^1[0-9]{10}$/;

//身份证号（18位）正则
var cP = /^[1-9]\d{5}(18|19|([23]\d))\d{2}((0[1-9])|(10|11|12))(([0-2][1-9])|10|20|30|31)\d{3}[0-9Xx]$/;

// 邮箱正则
var reg = /^([a-zA-Z]|[0-9])(\w|\-)+@[a-zA-Z0-9]+\.([a-zA-Z]{2,4})$/;

//调用方法
!reg.test(phone) //表示不符合手机号正则表达式

window.location.protocol+"//"+window.location.host; // 返回https://mp.csdn.net
window.location.host; //返回url 的主机部分，例如：mp.csdn.net
window.location.hostname; //返回mp.csdn.net
window.location.href; //返回整个url字符串(在浏览器中就是完整的地址栏)
window.location.pathname; //返回/a/index.php或者/index.php
window.location.protocol; //返回url 的协议部分，例如： http:，ftp:，maito:等等。
window.location.port //url 的端口部分，如果采用默认的80端口，那么返回值并不是默认的80而是空字符

//压缩base64方法
function dealImage(base64, w, callback) {
 var newImage = new Image();
 var quality = 0.6; //压缩系数0-1之间
 newImage.src = base64;
 newImage.setAttribute("crossOrigin", 'Anonymous'); //url为外域时需要
 var imgWidth, imgHeight;
 newImage.onload = function() {
 imgWidth = this.width;
 imgHeight = this.height;
 var canvas = document.createElement("canvas");
 var ctx = canvas.getContext("2d");
 if (Math.max(imgWidth, imgHeight) > w) {
 if (imgWidth > imgHeight) {
 canvas.width = w;
 canvas.height = w * imgHeight / imgWidth;
 } else {
 canvas.height = w;
 canvas.width = w * imgWidth / imgHeight;
 }
 } else {
 canvas.width = imgWidth;
 canvas.height = imgHeight;
 quality = 0.6;
 }
 ctx.clearRect(0, 0, canvas.width, canvas.height);
 ctx.drawImage(this, 0, 0, canvas.width, canvas.height);
 var base64 = canvas.toDataURL("image/jpeg", quality); //压缩语句
 callback(base64); //必须通过回调函数返回，否则无法及时拿到该值
 }
}