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#1 Created at ... [Delete] [Delete and Lock User]

  return arr.filter(function(x)
{
if(x>1)
{
var bo = true;
for(var i=2;i<x;i++)
{
if(x%i===0)
{
bo = false;
}
}
return bo;
}
});

#2 Created at ... [Delete] [Delete and Lock User]

补充一下

  return arr.filter(function(x)
{
if(x===1)
{
return;
}
for(var i=2;i<x;i++)
{
if(x%i===0)
{
return false;
}
}
return true;
});