node to read and write files xlsx

　　Beginning briefly, this is a read and write Excel, xlsx functions, mainly to help us to print or read some of the data.

　　Scenario: The main scenario is users need to export data, the similar we consume several years of money on a website, we need to look at running account, we as developers can be data corresponding finishing node of the service layer then give to customers through a written Excel.

　　step1: Load Module

　　Use Module: fs-- mainly for writing files;

　　　　　　　node-xlsx xlsx primarily used to convert the data file and reading of data xlsx;

the require FS = const ( 'FS') 
const = xlsx the require ( 'Node-xlsx'); // read xlsx plug

　　step2: reading function

　　Reading function is relatively simple, direct use Prase module (path) can be read Method

var list = xlsx.parse("./doc/hello.xlsx");

　　Return results, name: table name, data: two-dimensional array - due Excel expressed in tabular form, the form data is thus receives two-dimensional array.

[ { name: 'firstSheet', data: [ [Array], [Array] ] },
  { name: 'secondSheet', data: [ [Array], [Array] ] } ]

　　step3: write function

　　Write function, the write data corresponding to the above read function returns the format needs to be consistent, in the form of an array, name: data per row and two-dimensional array --Excel: table name, data.

　　The code below, generates an Excel file, are two tables, each table name is firstSheet, secondSheet

let xlsxObj = [
    {
        name: 'firstSheet',
        data: [
            [1, 2, 3],
            [4, 5, 6]
        ],
    },
    {
        name: 'secondSheet',
        data: [
            [7, 8, 9],
            [10, 1, 12]
        ],
    }
]

　　Generate Excel files

　　fs.writeFileSync (path, Buffer data)

　　xlsx.build (xlsxObj) the array will be converted into data Buffer

　　Execute the following command will generate a corresponding Excel file.

fs.writeFileSync('./doc/hello.xlsx',xlsx.build(xlsxObj),"binary");

　　These are the write operation by reading the new node to the Excel spreadsheet carried out.