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index6.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta http-equiv="X-UA-Compatible" content="IE=edge" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
<script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
</head>
<body>
<div id="watch-example">
<p>
Ask a yes/no question:
<input v-model="question" />
</p>
<p>{{ answer }}</p>
</div>
<!-- 因为 AJAX 库和通用工具的生态已经相当丰富，Vue 核心代码没有重复 -->
<!-- 提供这些功能以保持精简。这也可以让你自由选择自己更熟悉的工具。 -->
<script src="https://cdn.jsdelivr.net/npm/axios@0.12.0/dist/axios.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/lodash@4.13.1/lodash.min.js"></script>
<script>
var watchExampleVM = new Vue({
el: "#watch-example",
data: {
question: "",
answer: "I cannot give you an answer until you ask a question!",
},
watch: {
// 如果 `question` 发生改变，这个函数就会运行
question: function (newQuestion, oldQuestion) {
this.answer = "Waiting for you to stop typing...";
this.debouncedGetAnswer();
},
},
created: function () {
// `_.debounce` 是一个通过 Lodash 限制操作频率的函数。
// 在这个例子中，我们希望限制访问 yesno.wtf/api 的频率
// AJAX 请求直到用户输入完毕才会发出。想要了解更多关于
// `_.debounce` 函数 (及其近亲 `_.throttle`) 的知识，
// 请参考：https://lodash.com/docs#debounce
this.debouncedGetAnswer = _.debounce(this.getAnswer, 500);
},
methods: {
getAnswer: function () {
if (this.question.indexOf("?") === -1) {
this.answer = "Questions usually contain a question mark. ;-)";
return;
}
this.answer = "Thinking...";
var vm = this;
axios
.get("https://yesno.wtf/api")
.then(function (response) {
vm.answer = _.capitalize(response.data.answer);
})
.catch(function (error) {
vm.answer = "Error! Could not reach the API. " + error;
});
},
},
});
</script>
</body>
</html>