使用puppeteer在page.waitForFunction()内传递函数
以下是我的代码:
function hasDataBeenRefreshed(pastAvgGain, currentAvgGain) {
if (pastAvgGain!== currentAvgGain) {
return true
} else {
return false
}
}
async function getInfos(paire, page) {
let pastAvgGain = C.AVG_GAIN.textContent
await page.click(paire)
let currentAvgGain = C.AVG_GAIN.textContent
await page.waitForFunction(hasDataBeenRefreshed(pastAvgGain, currentAvgGain))
...
}
但是如果我这样做,我会收到此错误:
Error: Evaluation failed: TypeError: true is not a function
有没有办法达到这样的效果?
解决方案
page.waitForFunction()接受回调,现在您传入的是一个布尔值。要解决此问题,您可以执行以下操作:
await page.waitForFunction((pastAvgGain, currentAvgGain) => {
if (pastAvgGain!== currentAvgGain) {
return true
} else {
return false
}
} , {} , pastAvgGain, currentAvgGain )
https://github.com/puppeteer/puppeteer/blob/main/docs/api.md#pagewaitforfunctionpagefunction-options-args有关详细信息,请参阅文档
第三个参数是要传递给回调的参数
在您的评论之后:
await page.waitForFunction(() => {
return hasDataBeenRefreshed(pastAvgGain, currentAvgGain);
} )
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