$cannot be used in setTimeout. The specific platform is that Douyu www.douyu.com, wanted to automatically close the on-screen comment and wrote a tampermonkey plug-in, so he used the following code
$("div[class^="showdanmu-"]").click()F12 to be directly typed in the console. You can find the following div:
in the above statement<div class="showdanmu-42b0ac removed-9d4c42" title=""></div>but not if you put it in the delay function in js. The specific code is as follows:
setTimeout(function(){$("div[class^="showdanmu-"]").click();console.log("-sharp-sharp-sharpDouyu-sharp-sharp-sharp");},5000);the error is as follows:
VM1850:1 Uncaught ReferenceError: $ is not defined
at <anonymous>:1:31so I tried to simply enter
directly in the console.setTimeout(function(){console.log(typeof($));console.log("-sharp-sharp-sharpDouyu-sharp-sharp-sharp");},5000);get the following results
5572
VM2021:1 undefined
VM2021:1 -sharp-sharp-sharpDouyu-sharp-sharp-sharpquestion: did Douyu use something similar to scope to limit the use of $in setTimeout? Front-end contact soon do not know very well, the previous version of this statement ran on Douyu everything normal recently began to find $.
plugin address:
https://greasyfork.org/script.
now the temporary solution is to add jquery references to it, but it seems to conflict with Douyu himself, resulting in abnormal loading of the concerned page, so I have to ask for help from Daniel here
.