js uses an array to determine whether the same data exists in the submitted data_javascript skills

Copy code The code is as follows:

var productIds = $(".productId");
var arry = new Array();
arry = productIds;
var ary=arry.sort();
for(var i=0;i if(ary[i].value==ary[i 1].value){
alertMsg.confirm("The same medicines were detected, please check!", {
});
return;
}
}