I have done this a million times, i.e open the javascript file in the "Sources" tab, edit and hit CTRL+S to save it, upon which Chrome would confirm the same with a "Recompilation and Update Succeeded".
But I can no longer do this! There is no confirmation message in the console.
Also, the source window turns reddish indicating failure to do so.
The same script is getting edited from a different system.
I am on Chrome 41.0.2272.101m / WIN8.
The script is not "prettified", just to rule that answer out.!
Try using workspaces: https://developer.chrome.com/devtools/docs/workspaces
Add the project folder as a workspace in devtools by right-clicking in the left panel in Sources and choosing "Add Folder to Workspace".
Afterwards, select the javascript file from the folder in your workspace. Right-click anywhere within the file to choose "Map to Local Resource" and select the live file that matches the current file in your workspace.
This should allow you to update your JS file and any saved changes will be applied to the current page without refreshing.
I figured out a nice way to live edit a website's JS WITHOUT having to save anything. It also persists through page reloads, but you have to keep the developer console open:
-Add a breakpoint where you want to insert code.
-Edit this breakpoint and add whatever changes you want to have made.
-Make sure to end the line with "false;" so that the breakpoint never actually triggers (unless you want it to trigger)
Example: if the breakpoint condition is "valueToChange=100; false;", every time the execution goes over this line, 'valueToChange' will be set to 100.
You can refer following link. It shows step by step instruction. https://www.youtube.com/watch?v=PJDPIsOfFZE One thing I found is that Chrome extension Jet Brain plugin can be configured at option (right click on JB at chrome extension). Make sure the port number matches with Intellij debug port number. If you use JRebel, its port number is different from javascript debugger.
来源：https://stackoverflow.com/questions/29232701/unable-to-live-edit-javascript-in-chrome-developer-tools