JavaScript finds and returns specific elements and indexes in an array

Preface
This article mainly introduces you to the relevant information about using js to find the specified element in the array and return all the indexes of the element. The article gives detailed sample code, as follows Without further ado, let’s take a look at the detailed code examples.
Sample code

//在数组中查找所有出现的x，并返回一个包含匹配索引的数组
function findall(a,x){
 var results=[],
   len=a.length,
   pos=0;
 while(pos<len){
  pos=a.indexOf(x,pos);
  if(pos===-1){//未找到就退出循环完成搜索
   break;
  }
  results.push(pos);//找到就存储索引
  pos+=1;//并从下个位置开始搜索
 }
 return results;
}
  
var arr=[1,2,3,1,4,1,4,1];
findall(arr,1);//返回[0,3,5,7]

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