// 在数组arr中随机获取count数量的元素; const getRandomArrayElements = (arr, num) => { // 新建一个数组,将传入的数组复制过来,用于运算,而不要直接操作传入的数组; let temp_array = new Array(); for (let index in arr) { temp_array.push(arr[index]); } // 取出的数值项,保存在此数组 let return_array = new Array(); fo
之前有一篇文章详细介绍了如何获取网页在Facebook,Twitter和LinkedIn社交平台上分享的数量,点击这里查看.这里再扩充一下! Twitter GET URL: http://cdn.api.twitter.com/1/urls/count.json?url=http://stylehatch.co 返回结果: { "count":528, "url":"http://stylehatch.co/" } Facebook GET U
var keleyijson={"plug1":"myslider","plug2":"zonemenu"} function JSONLength(obj) { var size = 0, key; for (key in obj) { if (obj.hasOwnProperty(key)) size++; } return size; }; document.write("json对象的元素个数是:"
方法一:新增models的Manager方法 下面就直接发代码了 class RandomManager(models.Manager): def get_queryset(self): return super(RandomManager, self).get_queryset().order_by('?') 使用的时候 class TrainWord(models.Model): ''' User train word ''' word = models.CharField(max_leng
方式一: /** * 两个线程要是可见的所以要加上votalile */public class Test_01 { public static void main(String[] args) { final Test_01_Container t = new Test_01_Container(); new Thread(new Runnable() { @Override public void run() { for(int i = 0; i < 10; i++){ System.out
1.sql <select id="getTypeNum" resultType="TypeNum" > select count(*) as allNum, ' or null) as num1, ' or null) as num2, ' or null) as num3, ' or null) as num4, ' or null) as num4 from supplier_patent a </select> 2,对象 3,显示
getifaddrs()和struct ifaddrs的使用,获取本机IP 博客分类: Linux C编程 ifaddrs结构体定义如下: struct ifaddrs { struct ifaddrs *ifa_next; /* Next item in list */ char *ifa_name; /* Name of interface */ unsigned int ifa_flags; /* Flags from SIOCGIFFL
getifaddrs()和struct ifaddrs的使用,获取本机IP ifaddrs结构体定义如下: struct ifaddrs { struct ifaddrs *ifa_next; /* Next item in list */ char *ifa_name; /* Name of interface */ unsigned int ifa_flags; /* Flags from SIOCGIFFLAGS */ struct sockaddr *ifa_addr; /* Addre
