JavaScript常用方法汇总
JavaScript一种直译式脚本语言，是一种动态类型、弱类型、基于原型的语言，内置支持类型。那么JavaScript常用方法有哪些？跟yjbys小编一起来学习吧！
经常使用的 JS 方法，今天记下，以便以后查询
/* 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)),
}
/* 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;
}
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 "";
}
/* 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);
/* 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;
}
/* 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;
};
/* 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;
}
/* 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();
/* 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);
}
}
/* 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″);
}
}