.replace() not working correctly

I have a string that i would like to convert.

the string is image and the content is: Gone in 60 seconds What i need is the following: Gone_in_60_seconds But when i try: image = image.replace(" ","_"); the result is: 开发者_如何学JAVAGone_in 60 seconds so only the first space gets replaced. How would i convert all the spaces to underscores?

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Try this:

image = image.replace(/ /g, "_");