vue方法调用传参，es6模版字符串怎么转表达式？

vue方法调用传参，es6模版字符串怎么转表达式？

this.uploadFile(file, 'databaseCsvFiles')

uploadFile(file, target) {
    `this.${target}` = xxx
    // 报错 Invalid left-hand side in assignment expression
}