The invoice details of fruit purchase can be written as follows: invoice header, invoice number and date, commodity details, commodity unit price and amount, total amount, tax amount and tax amount information, and seller information.

1. Invoice header: write the name of the buyer, company or individual.

2. Invoice number and date: Each invoice has a unique number and invoice date.

3. Commodity details: list the varieties and quantities of fruits purchased. For example: 5 kg of apples, 2 bananas, 1 box of oranges, etc.

4. Commodity unit price and amount: for each fruit variety, write down the unit price and corresponding amount. For example: apple 10 yuan/Jin, * * * 50 yuan.

5. Total amount: Add all the fruits to get the total amount.

6. Tax amount and tax information: According to local tax laws, tax amount and related tax information need to be included.

7. Seller information: Write down the name, address and contact information of the merchant selling fruit.