layer彈出輸入框並回調

layer.prompt({
    title:'添加航線',
    btn2:function(index){
        //點擊取消執行的代碼

    }
},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("已存在該航線，無需添加");
    }

})