在Pupeteer中,我想将任意数量的ElementHandle传递给数组中的方法计算:
const element1=await page.$(".element")
const element2=await page.$(".another-element")
await page.evaluate((elements)=>{
// do stuff with the array of elements
,[element1, element2]);
但是,因为ElementHandle不可序列化,所以会出现以下错误:
TypeError: Converting circular structure to JSON
有没有办法实现这个目标?
答案 0 :(得分:1)
目前无法做到这一点。但你可以简单地转换你的elemetHandles数组,帮助扩展到参数,然后使用rest运算符将它们再次收集到数组中:
const puppeteer = require('puppeteer');
const html = `
<html>
<body>
<div class="element">element 1</div>
<div class="element">element 2</div>
<div class="element">element 3</div>
</body>
</html>`;
(async () => {
const browser = await puppeteer.launch();
const page = await browser.newPage();
await page.goto(`data:text/html,${html}`);
const element1 = await page.$('.element:nth-child(1)');
const element2 = await page.$('.element:nth-child(2)');
const element3 = await page.$('.element:nth-child(3)');
const result = await page.evaluate((...elements) => {
// do stuff with the array of elements
return elements.map(element => element.textContent);
}, ...[element1, element2, element3]);
console.log(result);
await browser.close();
})();