arr2数组添加内容时不能与之前的内容重复

Question

var arr=[1,2,3,4,5,6,7,8,9,10];

var arr2=[];

$(function(){

$('.btn').on('click',function(){

var push=arr[Math.floor(Math.random()*arr.length)];

arrJoin(push);

})

});

function arrJoin(joinNub){

for(var i=0;i<arr2.length;i++){

if(joinNub==arr[i]){

joinNub=arr[Math.floor(Math.random()*arr.length)];

arrJoin(joinNub);

}

}

arr2.push(joinNub);

}

//每次点击都添加一个新的数字到arr2，不知道哪里没做好，求大神指点

Answer 1

if(joinNub==arr[i]){if(joinNub==arr2[i]){