what is the javascript equivalent function for vbscript Mid function? is that substring() or substr()?

Question

There are two javascript solutions for this,

1. String.substring(from,to) 
2. String.substr(from,length)

what is the most convenient solution for vb script Mid() function

Answer 1

The method substr matches the usage of VB Mid function closest. The obvious difference is the the VB function takes a string as an argument, where the JS substr is a method of the string object.

string.substr(start,length)

Answer 2

foo = "Hello World!".substr(2, 4);

is the same as

foo = Mid("Hello World!", 2, 4)