Express中aixos请求的(批量)删除用POST方法，其它请求的(批量)删除可以用DELETE方法

axios请求：

前端：home.jsx

const params = {
                idArr: JSON.stringify(this.state.selectedRowKeys)
            }

            const _this = this;

            axios.post(`http://localhost:5555/api/delete_blogs`, qs.stringify(params)).then((resp) => {
                if (resp.data.ret) {
                    notification['success']({
                        message: '成功提示',
                        description: resp.data.msg,
                    })
                    _this.getData(0, 5);
                } else {
                    notification['error']({
                        message: '错误提示',
                        description: resp.data.msg,
                    })
                }
            }, (err) => {
                notification['error']({
                    message: '错误提示',
                    description: '网络错误，删除失败！'
                })
            });

后端：main.js

app.post("/api/delete_blogs", (req, res) => {
    let obj = {
        ret: false,
        msg: ""
    }

    var idArr = JSON.parse(req.body.idArr);

    for(let i = 0; i<idArr.length; i++){
        connection.query(`DELETE FROM blog WHERE id='${idArr[i]}'`, (error, results, fields) => {
            if(!error){
                obj.ret = true;
                obj.msg = "删除成功！";
                res.header("Access-Control-Allow-Origin", "*");
                res.type('application/json');
                res.jsonp(obj);
            }else{
                next(error);
            }
        })
    }
})

普通的请求：

前端：

function deleteBackupTask(id){
    alertify.confirm('确定删除吗？', function (e) {
        if (e) {
            // delete begin，asyncAjax是一个封装Jquery的Promise
            tool.asyncAjax('/api/delete_backup_task', 'DELETE', {id:id}).then(result => {
                if (result.ret) {
                    toastr.success(result.msg, "成功提示");
                    $backupTaskTable.bootstrapTable("refresh");
                } else {
                    toastr.error(result.message, "错误提示");
                }
            }).catch(error => {
                console.log(error);
            })
            // delete end
        } else {
            // user clicked "cancel"
        }
    });
}

后端： 

// 删除
app.delete("/delete", (req, res) => {
    var dataObj = { ret: false, msg: "" };

    var idArr = JSON.parse(req.body.userIdArr);

    fs.readFile("./file/obj.txt", function (error, data) {
        if (!error) {
            var userArr = JSON.parse(data);

            for (var i = 0; i < userArr.length; i++) {
                for (var n = 0; n < idArr.length; n++) {
                    if (userArr[i].id === idArr[n]) {
                        userArr.splice(i, 1);
                    }
                }
            }

            fs.writeFile("./file/obj.txt", JSON.stringify(userArr), function (error, data) {
                if (!error) {
                    dataObj.ret = true;
                    dataObj.msg = "删除用户成功！";
                    res.json(dataObj);
                } else {
                    dataObj.msg = "写入文件失败！";
                    res.json(dataObj);
                }
            })
        } else {
            dataObj.msg = "读取文件失败！";
            res.json(dataObj);
        }
    })
})