layer弹出输入框并回调

layer.prompt({
    title:'添加航线',
    btn2:function(index){
        //点击取消执行的代码

    }
},function(val,index){
    let equal = $("#comp_route option[val='"+val+"']").get(0);
    if((typeof equal)=="undefined"){
        $.post('comp/addRoute',{name:val},function(msg){
            console.log(msg) ;
        });
    }else{
        layer.msg("已存在该航线，无需添加");
    }

})