js There are six data types in the
1.String character string
2.Number The number
3.Boolean Boolean value
4.Null Null value
5.Undefined Undefined
6.Object object
String Use single quotation marks or double quotation marks
as follows
var x2='liujiayi';
var x3="haoshuai"But it can't be mixed
And double quotation marks cannot be nested in double quotation marks
Single quotation marks cannot be nested inside single quotation marks