In Python, if you use the replace method of string, all the relevant characters are changed, but in javascript, only the first part is changed and no further progress is made.

Solution: Use a regular expression

var s = "Hello World"; 
s.replace('o','p'); 
//result : Hellp World 
s.replace(/o/g,'p'); 
//result : Hellp Wprld 

Bonus! How can we change two different characters?

Solution: Use regular expressions well.

var s = "this is java-script"; s.replace(/s/g,'').replace(/-/g,''); 
//result : thisisjavascript 
//or 
s.replace(/-|s/g,'');