美文网首页
js常用方法总结

js常用方法总结

作者: 谢梦扬_ | 来源:发表于2017-04-19 20:45 被阅读0次

    1.手机类型判断

    var BrowserInfo = {
    userAgent: navigator.userAgent.toLowerCase()
    isAndroid: Boolean(navigator.userAgent.match(/android/ig)),
    isIphone: Boolean(navigator.userAgent.match(/iphone|ipod/ig)),
    isIpad: Boolean(navigator.userAgent.match(/ipad/ig)),
    isWeixin: Boolean(navigator.userAgent.match(/MicroMessenger/ig)),
    }
    

    2.返回字符串长度,汉子计数为2

    function strLength(str) {
    var a = 0;
    for (var i = 0; i < str.length; i++) {
      if (str.charCodeAt(i) > 255)
          a += 2;//按照预期计数增加2
      else
          a++;
    }
    return a;
    }
    
    

    3.获取url中的参数

    function GetQueryStringRegExp(name,url) {
    var reg = new RegExp("(^|\?|&)" + name + "=([^&]*)(\s|&|$)", "i");
    if (reg.test(url)) return decodeURIComponent(RegExp.$2.replace(/+/g, " ")); return "";
    } 
    

    4.js绑定事件适用于任何浏览器的元素绑定

    function eventBind(obj, eventType, callBack) {
      if (obj.addEventListener) {
          obj.addEventListener(eventType, callBack, false);
      }
      else if (window.attachEvent) {
          obj.attachEvent('on' + eventType, callBack);
      }
      else {
          obj['on' + eventType] = callBack;
      }
    };
    eventBind(document, 'click', bodyClick);
    

    5.获得当前浏览器JS的版本

    function getjsversion(){
    var n = navigator;
    var u = n.userAgent;
    var apn = n.appName;
    var v = n.appVersion;
    var ie = v.indexOf('MSIE ');
    if (ie > 0){
      apv = parseInt(i = v.substring(ie + 5));
      if (apv > 3) {
          apv = parseFloat(i);
      }
    } else {
      apv = parseFloat(v);
    }
    var isie = (apn == 'Microsoft Internet Explorer');
    var ismac = (u.indexOf('Mac') >= 0);
    var javascriptVersion = "1.0";
    if (String && String.prototype) {
      javascriptVersion = '1.1';
      if (javascriptVersion.match) {
          javascriptVersion = '1.2';
          var tm = new Date;
          if (tm.setUTCDate) {
              javascriptVersion = '1.3';
              if (isie && ismac && apv >= 5) javascriptVersion = '1.4';
              var pn = 0;
              if (pn.toPrecision) {
                  javascriptVersion = '1.5';
                  a = new Array;
                  if (a.forEach) {
                      javascriptVersion = '1.6';
                      i = 0;
                      o = new Object;
                      tcf = new Function('o', 'var e,i=0;try{i=new Iterator(o)}catch(e){}return i');
                      i = tcf(o);
                      if (i && i.next) {
                          javascriptVersion = '1.7';
                      }
                  }
              }
          }
      }
    }
    return javascriptVersion;
    }  
    

    6.获取当前点击事件的Object对象

    function getEvent() {
    if (document.all) {
       return window.event; //如果是ie
    }
    func = getEvent.caller;
    while (func != null) {
       var arg0 = func.arguments[0];
       if (arg0) {
           if ((arg0.constructor == Event || arg0.constructor == MouseEvent)
    || (typeof (arg0) == "object" && arg0.preventDefault && arg0.stopPropagation)) {
               return arg0;
           }
       }
       func = func.caller;
    }
    return null;
    }; 
    

    7.字符串截取方法

    getCharactersLen: function (charStr, cutCount) {
       if (charStr == null || charStr == '') return '';
       var totalCount = 0;
       var newStr = '';
       for (var i = 0; i < charStr.length; i++) {
           var c = charStr.charCodeAt(i);
           if (c < 255 && c > 0) {
               totalCount++;
           } else {
               totalCount += 2;
           }
           if (totalCount >= cutCount) {
               newStr += charStr.charAt(i);
               break;
           }
           else {
               newStr += charStr.charAt(i);
           }
       }
       return newStr;
    }  
    

    8.JS弹出新窗口全屏

    var tmp = window.open("about:blank", "", "fullscreen=1")
                           tmp.moveTo(0, 0);
                           tmp.resizeTo(screen.width + 20, screen.height);
                           tmp.focus();
                           tmp.location.href = 'http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html';
    
    var config_ = "left=0,top=0,width=" + (window.screen.Width) + ",height=" + (window.screen.Height);
                           window.open('http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html', "winHanle", config_);
    //模拟form提交打开新页面
    var f = document.createElement("form");
                           f.setAttribute('action', 'http://www.che168.com/pinggu/eva_' + msgResult.message[0] + '.html');
                           f.target = '_blank';
                           document.body.appendChild(f);
                           f.submit(); 
    
    
    1. 全选/全不选
    function selectAll(objSelect) {
           if (objSelect.checked == true) {
               $("input[name='chkId']").attr("checked", true);
               $("input[name='chkAll']").attr("checked", true);
           }
           else if (objSelect.checked == false) {
               $("input[name='chkId']").attr("checked", false);
               $("input[name='chkAll']").attr("checked", false);
           }
       }
    
    1. js判断浏览器
    判断是否是 IE 浏览器
    if (document.all){
       alert(”IE浏览器”);
    }else{
       alert(”非IE浏览器”);
    }
    if (!!window.ActiveXObject){
       alert(”IE浏览器”);
    }else{
       alert(”非IE浏览器”);
    }
    判断是IE几
    var isIE=!!window.ActiveXObject;
    var isIE6=isIE&&!window.XMLHttpRequest;
    var isIE8=isIE&&!!document.documentMode;
    var isIE7=isIE&&!isIE6&&!isIE8;
    if (isIE){
    if (isIE6){
       alert(”ie6″);
    }else if (isIE8){
       alert(”ie8″);
    }else if (isIE7){
       alert(”ie7″);
    }
    }  
    

    11.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";
    }
    }
    

    12.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;
               }
           }
       } 
    

    13.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;
    }
    } 
    

    14.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();
    }
    }
    

    15.JS 执行计时器

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

    16.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;
    };  
    
    1. 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
    }
    
    1. 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();
    };  
    
    1. 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('');
    };
    
    1. 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);
    }
    

    21.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);
    };  
    
    1. JS替换非法字符主要用在密码验证上出现的特殊字符
    function URLencode(sStr) {
    return escape(sStr).replace(/+/g, '%2B').replace(/"/g, '%22').replace(/'/g, '%27').replace(///g, '%2F');
    }; 
    
    1. 按Ctrl + Entert 直接提交表单
    document.body.onkeydown = function (evt) {
    evt = evt ? evt : (window.event ? window.event : null);
    if (13 == evt.keyCode && evt.ctrlKey) {
    
       evt.returnValue = false;
       evt.cancel = true;
       PostData();
    }
    }; 
    

    24.获取当前时间

    function GetCurrentDate() {
       var d = new Date();
       var y = d.getYear()+1900;
       month = add_zero(d.getMonth() + 1),
       days = add_zero(d.getDate()),
       hours = add_zero(d.getHours());
       minutes = add_zero(d.getMinutes()),
       seconds = add_zero(d.getSeconds());
       var str = y + '-' + month + '-' + days + ' ' + hours + ':' + minutes + ':' + seconds;
       return str;
    };
    function add_zero(temp) {
       if (temp < 10) return "0" + temp;
       else return temp;
    }
    
    1. Js去掉空格方法
    String.prototype.Trim = function()
    { return this.replace(/(^s*)|(s*$)/g, ""); }
    String.prototype.LTrim = function()
    {return this.replace(/(^s*)/g, "");}
    String.prototype.RTrim = function()
    {return this.replace(/(s*$)/g, "");} 
    
    1. Js动态移除head里的js引用
    this.ClearHeadJs = function (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);
    }; 
    

    27.整个UL点击事件 加在UL里的onclick里

    function CreateFrom(url, params) {
    var f = document.createElement("form");
    f.setAttribute("action", url);
    for (var i = 0; i < params.length; i++) {
        var input = document.createElement("input");
        input.setAttribute("type", "hidden");
        input.setAttribute("name", params[i].paramName);
        input.setAttribute("value", params[i].paramValue);
        f.appendChild(input);
    }
    f.target = "_blank";
    document.body.appendChild(f);
    f.submit();
    };
    
    1. 判断浏览器使用的是哪个 JS 版本
    <script language="javascript">
     var jsversion = 1.0;
    </script>
    <script language="javascript1.1">
     jsversion = 1.1;
    </script>
    <script language="javascript1.2">
     jsversion = 1.2;
    </script>
    <script language="javascript1.3">
     jsversion = 1.3;
    </script>
    <script language="javascript1.4">
     jsversion = 1.4;
    </script>
    <script language="javascript1.5">
     jsversion = 1.5;
    </script>
    <script language="javascript1.6">
     jsversion = 1.6;
    </script>
    <script language="javascript1.7">
     jsversion = 1.7;
    </script>
    <script language="javascript1.8">
     jsversion = 1.8;
    </script>
    <script language="javascript1.9">
     jsversion = 1.9;
    </script>
    <script language="javascript2.0">
     jsversion = 2.0;
    </script>
    alert(jsversion)
    

    相关文章

      网友评论

          本文标题:js常用方法总结

          本文链接:https://www.haomeiwen.com/subject/xtehzttx.html