用axios给后台发送json格式的数据，总是报这个错

Question

let params;
    request({
        headers: {
            'Content-Type': 'application/json'
        },
        transformRequest: [function(data) {
            data = JSON.stringify(data)
            return data
        }],
        url: '/servlet2/DeletedServlet',
        timeout:50000,
        method: 'post',
        params: {
            deletedId:5
        },
        data: {
            'deletedId': params.deletedId  //传的参数
        },
    })

希望各位大佬帮帮忙，尝试了许多方法仍然未果，我是小白

Answer 1

怕是这样写的把

let params = {
deletedId:5
};
request({
headers: {
'Content-Type': 'application/json'
},
transformRequest: [function(data) {
data = JSON.stringify(data)
return data
}],
url: '/servlet2/DeletedServlet',
timeout:50000,
method: 'post',

data: {
'deletedId': params.deletedId //传的参数
},
})