Simple use of substr and substring

substr()

The substr() method extracts the specified number of characters starting from the start subscript in a string
Note: Return a new string containing length characters starting from the start (including the character referred to by start) of stringObject. If length is not specified, the returned string contains characters from start to the end of stringObject. Can be regarded as [a,b)

grammar:

(start,length)

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use:

var str = "abdcdsnfe";
var str1 = str.substr(1, 3);
console.log(str1);//bdc

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substring()

The substring() method is used to extract characters in a string between two specified subscripts.
Note: Return a new string with the value containing a substring of stringObject, whose content is all characters from start to stop-1, with a length of stop minus start. That is, substring(a, b) represents the character whose subscript starts from a to end of b, including the a-th character but does not contain the b-th character, which can be regarded as [a, b).

grammar:

(start,stop)

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use:

var str = "abdcdsnfe";
var str1 = str.substring(1, 3);
console.log(str1);//bd

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The difference between substr and substring

The first parameter is also the start subscript value, the second parameter substr is the length, and the substring is the subscript value