a = arr.filter(function(element,index,self){
if (element <= 1) {
return false;
}
if (element <= 3) {
return true;
//只需要检查到n的平方根即可
let sqrtN = Math.sqrt(element);
for (let i = 2; i <=sqrtN; i++){
if (element % i === 0){
});
return a;
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a = arr.filter(function(element,index,self){
if (element <= 1) {
return false;
}
if (element <= 3) {
return true;
}
//只需要检查到n的平方根即可
let sqrtN = Math.sqrt(element);
for (let i = 2; i <=sqrtN; i++){
if (element % i === 0){
return false;
}
}
return true;
});
return a;