javascript - 如何在javascript中获取特定子字符串后的子字符串

Question

我正在制作一个自动回答琐事问题的机器人。我被困在这一点上。我有问题的字符串，我想将它从包含琐事的所有问题的字符串中分离出来。

在这个例子中，我有带有问题的字符串:

    var questions=`This was the first 3-D film*Bwana Devil
    This was the first cartoon talking picture*Steamboat Willie
    This was the sequel to "Star Wars"*The Empire Strikes Back`

我有一个变量

    var str="This was the first cartoon talking picture"

而我需要在有问题的字符串中找到str的字符串，得到*后面的部分，所以

    "Steamboat Willie"

.

我真的不知道该怎么做。

Answer 1

假设您的字符串在每个问题和答案对之间使用换行符格式化:

1。用每个换行符拆分整个字符串:

var questionAnswerStringPairs = string.split('\n');

这将创建一个问题和答案字符串数组。每个答案将以“*”分隔。

2。映射结果数组，并创建匹配的对象:

// This will store our data.
var questionAnswerPairs = {};

// Let's go through each string from step one and add the question and
// its answer to our object.
questionAnswerStringPairs.forEach( function(pair) {
  // split the string at the *
  pair = pair.split('*');

  // pair is now an array, the first element is the question string
  // the second element is the answer. Let's set those!
  var question = pair[0];
  var answer = pair[1];

  // now let's store that info in the object.
  questionAnswerPairs[question] = answer;
});

现在，您可以这样做:questionAnswerPairs['question i want the answer to']，或者这样:questionAnswerPairs[stringObjectWithQuestion]，你会得到你的答案!