What is the difference between substr and substring in javascript

The difference between substr and substring in javascript is: substr extracts a string of specified length starting from the starting index number; substring extracts the characters between two specified index numbers in the string.

Difference introduction:

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substr( start,length) is to extract a string of specified length starting from the starting index number;

substring(start,stop) is to extract the characters between two specified index numbers in the string; (same as in Java ), mathematically equivalent to extracting characters between [start,stop).

Example:

var letters = "abcdefg";
console.log(letters.substr(1,3))//结果为bcd
console.log(letters.substring(1,3));//结果为bc

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