var Ajax = function(url, type success, error) {
$.ajax({
url: url,
type: type,
dataType: 'json',
timeout: 10000,
success: function(d) {
var data = d.data;
success && success(data);
},
error: function(e) {
error && error(e);
}
});
};
// 使用方法：
Ajax('/data.json', 'get', function(data) {
console.log(data);
});

function jsonp(config) {
var options = config || {}; // 需要配置url, success, time, fail四个属性
var callbackName = ('jsonp_' + Math.random()).replace(".", "");
var oHead = document.getElementsByTagName('head')[0];
var oScript = document.createElement('script');
oHead.appendChild(oScript);
window[callbackName] = function(json) { //创建jsonp回调函数
oHead.removeChild(oScript);
clearTimeout(oScript.timer);
window[callbackName] = null;
options.success && options.success(json); //先删除script标签，实际上执行的是success函数
};
oScript.src = options.url + '?' + callbackName; //发送请求
if (options.time) { //设置超时处理
oScript.timer = setTimeout(function () {
window[callbackName] = null;
oHead.removeChild(oScript);
options.fail && options.fail({ message: "超时" });
}, options.time);
}
};
// 使用方法：
jsonp({
url: '/b.com/b.json',
success: function(d){
//数据处理
},
time: 5000,
fail: function(){
//错误处理
} 
});

var validate = function(num) {
var exp = /^1[3-9]\d{9}$/;
return exp.test(num);
};

var exp = /^[1-9]{1}[0-9]{14}$|^[1-9]{1}[0-9]{16}([0-9]|[xX])$/;

var exp = /^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/;

$(window).scroll(function() {
var a = $(window).scrollTop();
if(a > 100) {
$('.go-top').fadeIn();
}else {
$('.go-top').fadeOut();
}
});
$(".go-top").click(function(){
$("html,body").animate({scrollTop:"0px"},'600');
});

function stopBubble(e){
e = e || window.event; 
if(e.stopPropagation){
e.stopPropagation(); //W3C阻止冒泡方法 
}else { 
e.cancelBubble = true; //IE阻止冒泡方法 
} 
}

var replaceAll = function(bigStr, str1, str2) { //把bigStr中的所有str1替换为str2
var reg = new RegExp(str1, 'gm');
return bigStr.replace(reg, str2);
}

var getURLParam = function(name) {
return decodeURIComponent((new RegExp('[?|&]' + name + '=' + '([^&;]+?)(&|#|;|$)', "ig").exec(location.search) || [, ""])[1].replace(/\+/g, '%20')) || null;
};

function cloneObj(obj) {
var o = obj.constructor == Object ? new obj.constructor() : new obj.constructor(obj.valueOf());
for(var key in obj){
if(o[key] != obj[key] ){
if(typeof(obj[key]) == 'object' ){
o[key] = mods.cloneObj(obj[key]);
}else{
o[key] = obj[key];
}
}
}
return o;
}

var unique = function(arr) {
var result = [], json = {};
for (var i = 0, len = arr.length; i < len; i++){
if (!json[arr[i]]) {
json[arr[i]] = 1;
result.push(arr[i]); //返回没被删除的元素
}
}
return result;
};

var isRepeat = function(arr) { //arr是否有重复元素
var hash = {};
for (var i in arr) {
if (hash[arr[i]]) return true;
hash[arr[i]] = true;
}
return false;
};

function randombetween(min, max){
return min + (Math.random() * (max-min +1));
}

own.setCookie = function(cname, cvalue, exdays){
var d = new Date();
d.setTime(d.getTime() + (exdays*24*60*60*1000));
var expires = 'expires='+d.toUTCString();
document.cookie = cname + '=' + cvalue + '; ' + expires;
};
own.getCookie = function(cname) {
var name = cname + '=';
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);
if (c.indexOf(name) != -1) return c.substring(name.length, c.length);
}
return '';
};

(function(a, b) {
console.log(a+b); //30
})(10, 20);

var arr = [12, 222, 44, 88];
arr.length = 2; //截取，arr = [12, 222]; 
arr.length = 0; //清空，arr will be equal to [].

var numbers = [5, 45822, 120, -215];
var maxInNumbers = Math.max.apply(Math, numbers); //45822
var minInNumbers = Math.min.apply(Math, numbers); //-215

0.1 + 0.2 == 0.3 //false

var arr = [1, 5, 6, 3]; //数字数组
arr.sort(function(a, b) {
return a - b; //从小到大排
return b - a; //从大到小排
return Math.random() - 0.5; //数组洗牌
});
var arr = [{ //对象数组
num: 1,
text: 'num1'
}, {
num: 5,
text: 'num2'
}, {
num: 6,
text: 'num3'
}, {
num: 3,
text: 'num4'
}]; 
arr.sort(function(a, b) {
return a.num - b.num; //从小到大排
return b.num - a.num; //从大到小排
});

var obj = {a: 'aaa', b: 'bbb'};
var objStr = JSON.stringify(obj); // "{"a":"aaa","b":"bbb"}"
var newObj = JSON.parse(objStr); // {a: "aaa", b: "bbb"}