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<script>
/* var arr= ["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"];
var newarr=[];
function getRandom(min,max){
return Math.floor(Math.random()*(max-min+1))+min;
}
function select(data,arr){
var flag=false;
for(i=0;i<arr.length;i++){
if(data==arr[i]){
flag=true;
}
}
return flag;
}
do{
var index=getRandom(0,arr.length-1);
if(select(arr[index],newarr)==false){
newarr[newarr.length]=arr[index];
}
} while(newarr.length!=4);
console.log(newarr); */
/* function roa(arr) {
var temp=[];
var count=arr.length;
for (i=0;i<count;i++)
{
var num=Math.floor(Math.random()*arr.length);
temp.push(arr[num]);
arr.splice(num,1);
}
return temp;
}
console.log(roa([1,5,7,4,8,6])); */
/* var arr = [0,1,2,3,4,5,6,7,8,9];
var out = [];
var num = 5;
while(out.length < num){
var temp = (Math.random()*arr.length);
out.push(arr.splice(temp,1));
}
alert(out) */
/* function random(len, start, end) {
var arr = [];
function creat(start, end) {
var numlen= end - start;
return parseInt(Math.random() * numlen+ start)
}
while (arr.length < len) {
var num = creat(start, end);
if (arr.indexOf(num) == -1) {
arr.push(num);
}
}
return arr;
}
console.log(random(4,0,100)); */
/* function getArrayItems(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;
var temp_array = new Array();
for (var index in arr) {
temp_array.push(arr[index]);
}
//取出的数值项,保存在此数组
var return_array = new Array();
for (var i = 0; i<num; i++) {
//判断如果数组还有可以取出的元素,以防下标越界
if (temp_array.length>0) {
//在数组中产生一个随机索引
var arrIndex = Math.floor(Math.random()*temp_array.length);
//将此随机索引的对应的数组元素值复制出来
return_array[i] = temp_array[arrIndex];
//然后删掉此索引的数组元素,这时候temp_array变为新的数组
temp_array.splice(arrIndex, 1);
} else {
//数组中数据项取完后,退出循环,比如数组本来只有10项,但要求取出20项.
break;
}
}
return return_array;
}
//测试
var ArrList=[1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33];
alert(getArrayItems(ArrList,6)); */
/* function getRandomArrayElements(arr, count) {
var shuffled = arr.slice(0), i = arr.length, min = i - count;
while (i-- > min) {
var index = Math.floor((i + 1) * Math.random());
var temp = shuffled[index];
shuffled[index] = shuffled[i];
shuffled[i] = temp;
}
return shuffled.slice(min);
}
var items = ["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"];
console.log( getRandomArrayElements(items, 4) ); */
/* function RandomNumBoth(arr, maxNum) {
var numArr = [];
var arrLength = arr.length;
for (var i = 0; i < arrLength; i++) {
var number = Math.floor(Math.random() * arr.length);
numArr.push(arr[number]); //
arr.splice(number, 1); //
if (arr.length <= arrLength - maxNum) {
return numArr;
}
}
}
var arr=["鹿晗","王俊凯","蔡徐坤","彭于晏","周杰伦","刘德华","赵本山"];
console.log(RandomNumBoth(arr,4)); */
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