How to pass array to backend in vue? Method introduction

Vue, as a popular JavaScript framework, has been widely used in front-end development. In Vue, when processing front-end user input and submitting data to the backend, sometimes you need to pass an array to the backend. So, how to achieve it?

1. JSON.stringify

One method is to use the JSON.stringify() method to convert the array into a JSON format string, and then send the string to the backend.

For example, in Vue, if you want to send an array called myArray to the backend, you can write the code like this:

methods: {
  postData: function () {
    const myArray = [1, 2, 3, 4, 5];
    const jsonData = JSON.stringify(myArray);
    axios.post('/post', jsonData)
      .then(response => {
        console.log(response);
      })
      .catch(error => {
        console.log(error);
      });
  }
}

In this example, we pass JSON. stringify() converts the array myArray into a JSON-formatted string and sends it to the backend as data.

Of course, this method can also be implemented using other HTTP request libraries, such as jQuery.ajax() or XMLHttpRequest().

2. Use formData

Another method is to use the FormData object to process array data. FormData is an API for passing form data as key-value pairs when sending an HTTP request.

For example, in Vue, you can write code as follows:

methods: {
  postData: function () {
    const myArray = [1, 2, 3, 4, 5];
    const formData = new FormData();
    for (let i = 0; i < myArray.length; i++) {
      formData.append(&#39;myArray[]&#39;, myArray[i]);
    }
    axios.post(&#39;/post&#39;, formData)
      .then(response => {
        console.log(response);
      })
      .catch(error => {
        console.log(error);
      });
  }
}

In this example, we use the FormData object to add each array element to formData and name it 'myArray[ ]'. This is because in the backend, the data received will be an array and not a simple string.

This method can be used not only for arrays, but also for other complex data types, such as file uploads and image uploads.

In short, no matter which method is used, the reception method of the back-end program must be taken into consideration. In actual use, data transmission may need to be implemented based on different back-end technologies, and different technologies may also have different data format requirements. Similarly, when using Vue, you need to consider issues such as differences between different versions and interactions between components.

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