小编Apa*_*hka的帖子

我希望这个问题不是太开放.我遇到了锈,在那里我得到了内存问题的"内存不足"的呼吁next一对Iterator性状的对象.我不确定如何调试它.打印只会让我发生故障.我不熟悉ltrace等其他工具,所以虽然我可以创建一个跟踪(231MiB,pff),但我真的不知道如何处理它.这样的痕迹有用吗？抓住gdb/lldb会更好吗？还是Valgrind？

榆树新手在这里.

当我用CustomerSelect下面的Mpower模块替换下面模块中的元素时

customers = ["Select Customer","Customer 1","Customer 2","Customer 3"]
customerSelect =
  select [ ]
    [ List.map customerItem customers
    ]

我收到一个Elm Compiler"Type Mismatch"错误:

函数select期望第二个参数是:

List VirtualDom.Node

Run Code Online (Sandbox Code Playgroud)

但它是:

List (List Html)

Run Code Online (Sandbox Code Playgroud)

这是从哪里来的？

module Mpower where

import Html exposing (..)
import List exposing (..)

customerItem custname =
  option [ ] [ text custname ]

customerSelect =
  select [ ]
    [
    customerItem "Select Customer",
    customerItem "Customer 1",
    customerItem "Customer 2",
    customerItem "Customer 3"
    ]

view =
  div [] …