//get element 
Var front=document. GetElementById (' front '); 
Var spans=front. The children; 
//in 16 randomly generated 1-8 digital span, twice in every number 

//used to store 1 ~ 8 8 random number; 
Var arr1=[]; 
//used to store 0 ~ 15 to 16 random number; 
var arr2=[]; 
For (var I=0; I & lt; Spans. Length/2; I++) {//here if I & lt; Span length, will lead to find when the ninth cycle () function conflict 
Var random1=getRandom1 (); 
Var random2=getRandom2 (); 
//determine whether random number 1-8 in an array, not seen just put random Numbers in the arr1; 
if (! Find (random1, arr1)) {
Arr1. Push (random1); 
//determine whether random number 0 to 15 in the array, hadn't been put random Numbers in the arr2; 
if (! Find (random2 arr2)) {
Arr2. Push (random2); 
Spans [random2] innerHTML=random1;//will be randomly generated in 16 span number, but random2 randomly to repeat Numbers, there are Numbers of span of less than eight 
} 
} else {
I -;//repeat it returns recycle 
} 
//at this point in the only part of the span number 

} 

The console. The log (arr1); 
The console. The log (arr2); 
The console. Dir (spans); 


//to find the item in the arr is seen, seen returns true, have not seen or false; 
The function find (item, arr) {
For (var I=0; I & lt; Arr. Length; I++) {
If (item===arr [I]) return true; 
} 
return false; 
} 
//generated random Numbers 1-8 
The function getRandom1 (random) {
Var random=Math. Ceil ((Math. The random () * spans in length/2)); 
Return the random; 
} 
//to generate random Numbers 0-15, for span box 
The function getRandom2 (random) {
Var random=Math. Floor ((Math. The random () * spans in length)); 
Return the random; 
} 

CodePudding user response:

 
Var arr=[]; 
For (var I=1; I & lt;=spans. Length/2; I++) {
Arr. Push (I, I); 
} 
For (var I=0; I & lt; Spans. Length; I++) {
Spans [I] innerHTML=arr. Splice (Math) floor ((Math) random () * arr in length)), 1) [0]. 
} 

CodePudding user response:

reference 1/f, the sky wave response:

 
Var arr=[]; 
For (var I=1; I & lt;=spans. Length/2; I++) {
Arr. Push (I, I); 
} 
For (var I=0; I & lt; Spans. Length; I++) {
Spans [I] innerHTML=arr. Splice (Math) floor ((Math) random () * arr in length)), 1) [0]. 
} 

Arr. Splice (Math. Floor ((math.h random () * arr in length)), 1)
This is random delete an array of digital
But what is the role of [0] behind ah, is it {arr. Splice (math.h floor ((math.h random () * arr in length)), 1)} the deleted content will also be an array, and then take the first?

CodePudding user response:

Is it 1 ~ 8 random take 2 times, in the 16 grid?

CodePudding user response:

bubble fish _ reference 3 floor response:

is 1 ~ 8 random take 2 times, in the 16 grid?

Yes, the requirement is 16 in the grid, 1-8 each two, random distribution

CodePudding user response:

lazy way,

 
Var arr=[1, 2, 3, 4, 5, 6, 7, 8, 1, 2, 3, 4, 5, 6, 7, 8]. 
Arr. Sort ((a, b)=& gt; Math. The random () 0.5); 
console.log(arr); 

CodePudding user response:

Splice can remove multiple elements of the array, and returns an array composed of multiple elements were removed,
If only remove one element is returned only one element of array,