28个常用JavaScript方法集锦

经常使用的 JS 方法，今天记下，以便以后查询

/* 手机类型判断 */

复制代码 代码如下:

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  */

复制代码 代码如下:

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

复制代码 代码如下:

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  */

复制代码 代码如下:

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 */

复制代码 代码如下:

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 */

复制代码 代码如下: