Question

我有一系列的承诺，它正在运行pass和fail回调。无法弄清楚原因。

checkForLists: function() {
    var listCheckPromise = [];

    $.each(scmap.lists, function(i, list) {
        listCheckPromise[i] = $().SPServices({
            operation: "GetList",
        listName: list.name,
        })
    })

    $.map(listCheckPromise, function(listPromise, index){
        listPromise.then( pass(index), fail(index) )
    })

    function pass(index) {
      var currentList = scmap.lists[index]
      console.log("PASS:", currentList.name, 'list already created')
    }

    function fail(index) {
      var currentList = scmap.lists[index]
      console.log("FAIL:", currentList.name, 'does not exist. Creating...')
      scmap.createList(currentList)
    }
}

Answer 1

“ ......无法找出原因。”

简单...因为你致电

$.map(listCheckPromise, function(listPromise, index){
    listPromise.then(
      pass(index), // <-- pass!
      fail(index)) // <- and fail!
})

您可能想尝试

$.map(listCheckPromise, function(listPromise, index){
    listPromise.then(
      function(){pass(index);},
      function(){fail(index);})
})

Answer 2

当你写这个

listPromise.then( pass(index), fail(index) )

您立即执行此2个功能，而不是提供参考

你应该写这样的东西

listPromise.then( pass, fail )

承诺运行成功和失败回调

2 个答案: