axios的post请求用URLSearchParams格式化参数

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var params = new URLSearchParams();
params.append('param1', 'value1');
params.append('param2', 'value2');
axios.post('/foo', params);

暂记-formDate的用途

var formData = new FormData();
formData.append('file', this.file);
var config = {
    headers: {
        'Content-Type': 'multipart/form-data'
    }
};