Question

我有这个for循环：

for(var i = 0; i < characters.length; i++)
{
   var character = characters[i];
   charService.get(character.name).then(function (characterData)
   {
        //I want character to be captured here, i.e. the character in the current loop
        character.data = characterData;
   });
}

由于charService.get()是异步的，所以在执行回调时，character是数组的最后一个元素（因为循环已经结束），因此所有以前的character都是单独留下没有数据。

如何保证回调中的character.data引用异步方法执行的循环的character？

Answer 1

您可以将其包装成功能

Class1 c = TempData["class1"] as Class1;

Answer 2

尝试在Function.prototype.bind()功能使用.then()，设置为character

for(var i = 0; i < characters.length; i++)
{
   var character = characters[i];
   charService.get(character.name).then(function (characterData)
   {
        //I want character to be captured here, i.e. the character in the current loop
        this.data = characterData;
   }.bind(character));
}

如何在异步回调

2 个答案: