substr vs substring

Mysql will use the same language method:SELECT ' column ' from ' table ' where ' condition ' like '%keyword% 'In fact, you can use both the locate and InStr functions insteadSELECT ' column ' from ' table ' where locate(' keyword ', ' condition ') >

1-Hierarchical inheritance2-Variable and immutable concepts3-string3.1-string is a very special class3.2-string literals vs. String objectsMethods of 3.3-string3.3.1-length ()3.3.2-concat (String)3.3.3-indexof (..)3.3.4-substring (..)3.3.5-replace3.3

This article describes the attributes and methods of String objects of JavaScript native objects. This article describes the attributes and methods of length, charAt (), charCodeAt (), concat (), and indexOf (), lastIndexOf () and other method

Length The Length property can return the number of characters in the string. Length is obtained based on the UTF-16 encoding of the string, with an empty string length of 0. Length is not modifiable. CharAt () The CharAt () method returns the

JavaScript language essence of string common method analysis 1. String Common Method Analysis 1.1 String.prototype.slice ()The slice (start,end) method copies part of a string to construct a new stringWhen startThe end parameter is optional and the

lengthThe Length property can return the number of characters in a string.Length is obtained based on the UTF-16 encoding of the string, with an empty string length of 0. Length cannot be modified.charAt ()The CharAt () method returns the character

Basic JavaScript data types and types detection, javascript Data Types1. [basic JavaScript Data Types] JavaScript has dynamic types. This means that the same variables can be of different types."String" "number" "object" "boolean" "function"

One, "JavaScript basic data Type"JavaScript has a dynamic type. This means that the same variable can be used as a different type"String" "Number" "Object" "Boolean" "function" "Undefined " String TypeProperty:Str.lengthvar str =

Process processing functions 1. Process Start functionFunction name EvalCall Syntax eval (string)The commentary considers a string as a Perl statement execution.When executed correctly, the system variable $@ is an empty string, and if there is an

Isfinite (123);//detection is a number (this returns TRUE)isNaN (123);//detection is not a number (return false here) ' Hello World '. IndexOf (' A ', 2);//Find matching character position does not return-1, note the following optional parameters