What is the use of {{product.getSalePrice ()}} of vue?

when I look at Vue-Essentials-Cheat-Sheet, I see the usage of

{{product.getSalePrice ()}}

. How does this work? How to write the js part?

Feb.28,2021

data() {
    return {
        product: {
            getSalePrice: function () {
                   ....  //do something
            },
            toString:function(){return 'productNmae'},
            valueOf :function(){return 23}
        }
    }
}

I guess so

console.log(product==23)//true

the method in the object, you can go like this:

data() {
    return {
        product: {
            getSalePrice: function () {
                   ....  //do something
            }
        }
    }
}
MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1beb05d-31a66.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1beb05d-31a66.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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