课程: Learning JavaScript Debugging

今天就学习课程吧！

今天就开通帐号，24,700 门业界名师课程任您挑！

Monitor variables with watches

Monitor variables with watches - JavaScript教程

课程: Learning JavaScript Debugging

开始一个月试用 购买团队方案

Monitor variables with watches

“

- [Narrator] In this video, we're going to talk about watches which are a way to monitor variable values and expression values over time. So here in this example file, here's my custom JavaScript at the bottom of the index.html. And I have some new functions here, some new data. So let's set a breakpoint here on line 325 for actionTime. And I'll refresh the page. So I've stopped at this point where this variable is going to be assigned. Now of course, when you wanna find what any particular variable is assigned to, you can look through the call stack. But depending on how deeply you have to go in here to find a particular piece, how many closures you have to go through, which part of the scope you wanna get into. Or how deep the data structure of your objects might go. It can be a little bit of a pain to have to hit all these triangles and go find the right thing. That's where watch expressions come in. So here in the watch expressions inspector, I can hit the plus sign to add a new…

内容