[英]Variable destructuring assignment after declaration in Javascript
First of all I carefully read the documentation here and checked similar StackOverflow questions.首先,我在这里仔细阅读了文档并检查了类似的 StackOverflow 问题。 I have a sequence of SQL requests.我有一系列 SQL 请求。 When I write this, everything works fine:当我写这篇文章时,一切正常:
const { rows } = await db.query(`
SELECT * FROM table
WHERE id = ${id}`)
But I'd like to make several requests, that's why I thought about writing this:但我想提出几个要求,这就是我想写这个的原因:
let rows;
{ rows } = await db.query(`
SELECT * FROM table
WHERE id = ${id}`)
// do something with the rows
{ rows } = await db.query(`
SELECT * FROM othertable
WHERE id = ${id}`)
// do something else
But I have this error:但我有这个错误:
{ rows } = await db.query(`
^
SyntaxError: Unexpected token '='
Seeing the documentation, it appears to be a simple assignment, I don't know what is wrong with this.看文档,好像是一个简单的赋值,不知道这有什么问题。 Any help would be very kind:)任何帮助都会非常友好:)
({rows} = await db.query(...))
you should use parenthesis to signal it's not a block but an assignment你应该用括号来表示它不是一个块,而是一个赋值
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