我正在开发一个Web捕获应用程序,似乎所有功能都具有异步功能,但控制台显示SyntaxError: await is only valid in async function
错误。
我试图将所有功能更改为异步,但似乎仍然无法正常工作。是否由于fs模块而出错?我想当我尝试在另一个应用程序中不使用fs模块时,它实际上可以工作。
这是我的完整代码
const puppeteer = require("puppeteer");
const fs = require('fs');
let galleryName = "frozen"; // Enter gallery name
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
// Adjustments particular to this page to ensure we hit desktop breakpoint.
page.setViewport({
width: 1000,
height: 10000,
deviceScaleFactor: 1
});
fs.readFile('db.txt', function (err, data) {
if (err) throw err;
let array = data.toString().split("\n");
for (i in array) {
console.log(`Now Processing : ${array[i]} ${array.length - i -1} left`);
await page.goto(`https://gall.dcinside.com/${galleryName}/${array[i]}`), { // !!!!ERROR shows from here
waitUntil: "networkidle2",
timeout: 0
};
async function screenshotDOMElement(opts = {}) {
const padding = "padding" in opts ? opts.padding : 0;
const path = "path" in opts ? opts.path : null;
const selector = opts.selector;
if (!selector) throw Error("Please provide a selector.");
const rect = await page.evaluate(selector => {
const element = document.querySelector(selector);
if (!element) return null;
const {
x,
y,
width,
height
} = element.getBoundingClientRect();
return {
left: x,
top: y,
width,
height,
id: element.id
};
}, selector);
if (!rect)
throw Error(
`Could not find element that matches selector: ${selector}.`
);
return await page.screenshot({
path,
clip: {
x: rect.left - padding,
y: rect.top - padding,
width: rect.width,
height: rect.height + padding * 2
}
});
}
await screenshotDOMElement({
path: `./result/${pageNumArray[i]}.png`,
selector: ".view_content_wrap",
padding: 10
});
}
});
// // await browser.close();
})();
fs中的回调函数也需要异步,
fs.readFile('db.txt', async function (err, data) {}
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我来说两句