JavaScript常用方法汇总

2017-01-14 00:00:00少芬 网页程序设计

  /* 判断浏览器 */

  function getOs() {

  if (navigator.userAgent.indexOf("MSIE 8.0") > 0) {

  return "MSIE8";

  }

  else if (navigator.userAgent.indexOf("MSIE 6.0") > 0) {

  return "MSIE6";

  }

  else if (navigator.userAgent.indexOf("MSIE 7.0") > 0) {

  return "MSIE7";

  }

  else if (isFirefox = navigator.userAgent.indexOf("Firefox") > 0) {

  return "Firefox";

  }

  if (navigator.userAgent.indexOf("Chrome") > 0) {

  return "Chrome";

  }

  else {

  return "Other";

  }

  }

  /* JS判断两个日期大小 适合 2012-09-09 与2012-9-9 两种格式的对比 */

  //得到日期值并转化成日期格式,replace(/\-/g, "\/")是根据验证表达式把日期转化成长日期格式,这样再进行判断就好判断了

  function ValidateDate() {

  var beginDate = $("#t_datestart").val();

  var endDate = $("#t_dateend").val();

  if (beginDate.length > 0 && endDate.length>0) {

  var sDate = new Date(beginDate.replace(/\-/g, "\/"));

  var eDate= new Date(endDate.replace(/\-/g, "\/"));

  if (sDate > eDate) {

  alert('开始日期要小于结束日期');

  return false;

  }

  }

  }

  /* 移除事件 */

  this.moveBind = function (objId, eventType, callBack) {

  var obj = document.getElementById(objId);

  if (obj.removeEventListener) {

  obj.removeEventListener(eventType, callBack, false);

  }

  else if (window.detachEvent) {

  obj.detachEvent('on' + eventType, callBack);

  }

  else {

  obj['on' + eventType] = null;

  }

  }

  /* 回车提交 */

  $("id").onkeypress = function (event) {

  event = (event) ? event : ((window.event) ? window.event : "")

  keyCode = event.keyCode ? event.keyCode : (event.which ? event.which : event.charCode);

  if (keyCode == 13) {

  $("SubmitLogin").onclick();

  }

  }

  /* JS 执行计时器 */

  timeStart = new Date().getTime();

  timesEnd = new Date().getTime();

  document.getElementById("time").innerHTML = timesEnd - timeStart;

  /* JS 写Cookie */

  function setCookie(name, value, expires, path, domain) {

  if (!expires) expires = -1;

  if (!path) path = "/";

  var d = "" + name + "=" + value;

  var e;

  if (expires < 0) {

  e = "";

  }

  else if (expires == 0) {

  var f = new Date(1970, 1, 1);

  e = ";expires=" + f.toUTCString();

  }

  else {

  var now = new Date();

  var f = new Date(now.getTime() + expires * 1000);

  e = ";expires=" + f.toUTCString();

  }

  var dm;

  if (!domain) {

  dm = "";

  }

  else {

  dm = ";domain=" + domain;

  }

  document.cookie = name + "=" + value + ";path=" + path + e + dm;

  };

  /* JS 读Cookie */

  function readCookie(name) {

  var nameEQ = name + "=";

  var ca = document.cookie.split(';');

  for (var i = 0; i < ca.length; i++) {

  var c = ca[i];

  while (c.charAt(0) == ' ') c = c.substring(1, c.length);

  if (c.indexOf(nameEQ) == 0) {

  return decodeURIComponent(c.substring(nameEQ.length, c.length))

  }

  } return null

  }

  /* Ajax 请求 */

  C.ajax = function (args) {

  var self = this;

  this.options = {

  type: 'GET',

  async: true,

  contentType: 'application/x-www-form-urlencoded',

  url: 'about:blank',

  data: null,

  success: {},

  error: {}

  };

  this.getXmlHttp = function () {

  var xmlHttp;

  try {

  xmlhttp = new XMLHttpRequest();

  }

  catch (e) {

  try {

  xmlhttp = new ActiveXObject("Msxml2.XMLHTTP");

  }

  catch (e) {

  xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");

  }

  }

  if (!xmlhttp) {

  alert('您的浏览器不支持AJAX');

  return false;

  }

  return xmlhttp;

  };

  this.send = function () {

  C.each(self.options, function (key, val) {

  self.options[key] = (args[key] == null) ? val : args[key];

  });

  var xmlHttp = new self.getXmlHttp();

  if (self.options.type.toUpperCase() == 'GET') {

  xmlHttp.open(self.options.type, self.options.url + (self.options.data == null ? "" : ((/[?]$/.test(self.options.url) ? '&' : '?') + self.options.data)), self.options.async);

  }

  else {

  xmlHttp.open(self.options.type, self.options.url, self.options.async);

  xmlHttp.setRequestHeader('Content-Length', self.options.data.length);

  }

  xmlHttp.setRequestHeader('Content-Type', self.options.contentType);

  xmlHttp.onreadystatechange = function () {

  if (xmlHttp.readyState == 4) {

  if (xmlHttp.status == 200 || xmlHttp.status == 0) {

  if (typeof self.options.success == 'function') self.options.success(xmlHttp.responseText);

  xmlHttp = null;

  }

  else {

  if (typeof self.options.error == 'function') self.options.error('Server Status: ' + xmlHttp.status);

  }

  }

  };

  xmlHttp.send(self.options.type.toUpperCase() == 'POST' ? self.options.data.toString() : null);

  };

  this.send();

  };

  /* JS StringBuilder 用法 */

  function StringBuilder() {

  this.strings = new Array;

  };

  StringBuilder.prototype.append = function (str) {

  this.strings.push(str);

  };

  StringBuilder.prototype.toString = function () {

  return this.strings.join('');

  };

  /* JS 加载到顶部LoadJS */

  function loadJS (url, fn) {

  var ss = document.getElementsByName('script'),

  loaded = false;

  for (var i = 0, len = ss.length; i < len; i++) {

  if (ss[i].src && ss[i].getAttribute('src') == url) {

  loaded = true;

  break;

  }

  }

  if (loaded) {

  if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();

  return false;

  }

  var s = document.createElement('script'),

  b = false;

  s.setAttribute('type', 'text/javascript');

  s.setAttribute('src', url);

  s.onload = s.onreadystatechange = function () {

  if (!b && (!this.readyState || this.readyState == 'loaded' || this.readyState == 'complete')) {

  b = true;

  if (fn && typeof fn != 'undefined' && fn instanceof Function) fn();

  }

  };

  document.getElementsByTagName('head')[0].appendChild(s);

  },

  bind: function (objId, eventType, callBack) { //适用于任何浏览器的绑定

  var obj = document.getElementById(objId);

  if (obj.addEventListener) {

  obj.addEventListener(eventType, callBack, false);

  }

  else if (window.attachEvent) {

  obj.attachEvent('on' + eventType, callBack);

  }

  else {

  obj['on' + eventType] = callBack;

  }

  }

  function JSLoad (args) {

  s = document.createElement("script");

  s.setAttribute("type", "text/javascript");

  s.setAttribute("src", args.url);

  s.onload = s.onreadystatechange = function () {

  if (!s.readyState || s.readyState == "loaded" || s.readyState == "complete") {

  if (typeof args.callback == "function") args.callback(this, args);

  s.onload = s.onreadystatechange = null;

  try {

  s.parentNode && s.parentNode.removeChild(s);

  } catch (e) { }

  }

  };

  document.getElementsByTagName("head")[0].appendChild(s);

  }

  /* 清空 LoadJS 加载到顶部的js引用 */

  function ClearHeadJs (src) {

  var js = document.getElementsByTagName('head')[0].children;

  var obj = null;

  for (var i = 0; i < js.length; i++) {

  if (js[i].tagName.toLowerCase() == "script" && js[i].attributes['src'].value.indexOf(src) > 0) {

  obj = js[i];

  }

  }

  document.getElementsByTagName('head')[0].removeChild(obj);

  };

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