javascript - Promise 运行成功和失败回调

Question

我有一系列的 promise ，它正在运行通过和失败回调。不明白为什么。

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

"... Can't figure out why."

简单...因为您打电话

$.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);})
})