解决办法

Ajax请求外定义变量

let _this=this;

Ajax请求内使用该变量调用Vue实例的数据

_this.数据名=要修改的值

错误的代码

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script type="text/javascript" src="js/vue.js"></script>
    <script src="https://cdn.staticfile.org/vue-router/2.7.0/vue-router.min.js"></script>
    <script src="https://cdn.staticfile.org/axios/0.18.0/axios.min.js"></script>
</head>
<body>
<div id="app" style="margin-left: 20%;margin-top: 10%">
    <p>传递的数据:<span style="color: red">{{myInfo}}</span></p>
    <p>输入水果的信息:</p>
    编号:<input type="text" v-model="fruitId"/>&nbsp;&nbsp;
    名称:<input type="text" v-model="fruitName"/>&nbsp;&nbsp;
    数量:<input type="text" v-model="fruitNum"/>
    <button @click="submitData">提交</button>
</div>
<script type="text/javascript">
    new Vue({
        el: '#app',
        data: {
            fruitId: 1,
            fruitName: '苹果',
            fruitNum: 3,
            myInfo: '这里显示传递的数据'
        },
        methods: {
            submitData: function () {
                axios
                    .post('https://www.zoutl.cn/getFruitJson2?id=' + this.fruitId + '&name=' + this.fruitName + '&num=' + this.fruitNum + '')
                    .then(function (response) {
                        let id = response.data.id;
                        let name = response.data.name;
                        let num = response.data.num;
                        this.myInfo = "编号:" + id + "，名称:" + name + "，数量:" + num;
                    })
                    .catch(function (error) {
                        console.log(error);
                    });
            }
        }
    })
</script>
</body>
</html>

点击提交按钮后，红色字体内容不改变

img

修改后

修改methods内的submitData方法

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methods: {
	submitData: function () {
		let _this = this;
		axios
			.post('https://www.zoutl.cn/getFruitJson2?id=' + this.fruitId + '&name=' + this.fruitName + '&num=' + this.fruitNum + '')
			.then(function (response) {
				let id = response.data.id;
				let name = response.data.name;
				let num = response.data.num;
				_this.myInfo = "编号:" + id + "，名称:" + name + "，数量:" + num;
			})
			.catch(function (error) {
				console.log(error);
			});
	}
}

点击提交按钮后，红色字体内容改变

img