JavaScript string Method (Common)

1.toLowerCase (); Converts the letters in a string to uppercase.

For example:

var str = "AbcD";

Str=str.tolowercase ();

The result is: ABCD

2.toUpperCase (); Converts the letters in a string to lowercase.

For example:

var str = "AbcD";

Str=str.touppercase ();

The result is: ABCD

3.substr (); Starts with the specified string, intercepts the specified number of characters, and returns a new string.

For example:

var v = "really rich";

var a = V.substr (UP);

The result is: a very

4.concat (); Inserts the specified string at the beginning of another string, returning a new string.

For example:

var v1 = "large";

var v2 = "Home good";

var v3 = V1.concat (v2);

The result: Hello, everyone.

5.indexof (); Returns the index of the first occurrence of a string, in another string, and returns the index if it does not-1;

For example:

var v = "Profound is the issuance of loans";

var a = V.indexof (of);

The result is: 2

6.lastindexof (); similar to indexof, but returns the last occurrence of the index.

For example:

var v = "Profound is the issuance of loans";

var a = V.lastindexof (of);

The result is: 7

7.replace (); In a string, search for content that matches another string and replace it.

var v = "Hello everyone, my name is XX";

var a = V.replace ("XX", "Zhang San");

The result is: Hello, my name Zhang San.

JavaScript string Method (Common)