javascript常见函数2

设置cookie

function setCookie(name,value,iDate){
    var oDate = new Date();
    oDate.setDate(oDate.getDate()+iDate);
    if(iDate){
        document.cookie = name + '=' +  value +';path=/;expires='+oDate;
    } else {
        document.cookie = name + '=' +  value +';path=/;';
    }
}

获取cookie

function getCookie(name){
    var arr = document.cookie.split('; ');
    for (var i=0;i<arr.length;i++){
        var arr2 = arr[i].split('=');
        if(arr2[0] == name){
            return arr2[1];
        }
    }
    return '';
}

移除指定名称cookie

function removeCookie(name){
    setCookie(name,1,-1);
}

json转字符串

function jsonToStr(json){
    json.t = Math.random();
    var arr = [];
    for (var name in json){
        arr.push(name + '=' + json[name]);
    }
    return arr.join('&');
}

ajax封装

function ajax(json){
    var timer = null;
    if(!json.url){
        alert('输入URL');
        return;
    }
    json.data = json.data || {};
    json.time = json.time || 3000;
    json.type = json.type || 'get';

    if(window.XMLHttpRequest){
        var oAjax = new XMLHttpRequest();
    } else {
        var oAjax = new ActiveXObject('Microsoft.XMLHTTP');
    }

    switch (json.type.toLowerCase()){
        case 'get':
            oAjax.open('GET',json.url+'?'+jsonToStr(json.data),true);
            oAjax.send();
            break;
        case 'post':
            oAjax.open('POST',json.url,true);
            oAjax.setRequestHeader('Content-Type','application/x-www-form-urlencoded');
            oAjax.send(jsonToStr(json.data));
            break;
        default:
            alert('输入正确提交方式');
            break;
    }

    oAjax.onreadystatechange = function () {
        if (oAjax.readyState == 4){
            if (oAjax.status>=200 && oAjax.status<300 || oAjax.status == 304){
                json.success && json.success(oAjax.responseText);
            } else {
                json.error && json.error(oAjax.status);
            }
        }
        clearTimeout(timer);
    };
    timer = setTimeout(function(){
        alert('响应超时！');
        oAjax.onreadystatechange = null;
    },json.time);
}

jsonp封装

function jsonp(json){
        if (!json.url) {
            alert('请输入正确的url！');
            return;
        }
        json.data=json.data || {};
        json.cbName=json.cbName || 'cb';
        var fnName='show'+Math.random();
        fnName=fnName.replace('.','');
        window[fnName]=function(jsonD){
            json.fnSucc &&　json.fnSucc(jsonD);
            //删
            document.head.removeChild(oS);
        };
        json.data[json.cbName]=fnName;
        var arr=[];
        for (var name in json.data) {
            arr.push(name+'='+json.data[name]);
        }
        var oS=document.createElement('script');
        oS.src=json.url+'?'+arr.join('&');
        document.head.appendChild(oS);
    };

正则获取class

function getClassName(parent,sClass){
    if(document.getElementsByClassName){
        return parent.getElementsByClassName(sClass);
    } else {
        var aELs = parent.getElementsByTagName('*');
        var arr =[];
        for (var i=0;i<aELs.length;i++){
            var reg = new RegExp('\\b'+sClass+'\\b');
            if(reg.test(aELs[i].className)){
                arr.push(aELs[i]);
            }
        }
        return arr;
    }
}

正则obj查找class

function hasClass(obj,sClass){
    var reg = new RegExp('\\b'+sClass+'\\b');
    return reg.test(obj.className);
}

正则obj添加className

function addClss(obj,sClass){
    if(obj.className){
        if(!hasClass(obj,sClass)){
            obj.className += ' ' + sClass;
        }
    } else {
        obj.className =  sClass;
    }
}

正则obj移除className

function removeClass(obj,sClass){
    var reg = new RegExp('\\b'+sClass+'\\b');
    if(obj.className){
        if(hasClass(obj,sClass)){
            obj.className = obj.className.replace(reg,'').replace(/\s+/g,' ').replace(/^\s+|\s+/g,'');
        }
    }
}