How to determine whether a string contains a certain string in javascript

Javascript method to determine whether a string contains a certain string: 1. Use the [indexOf()] method; 2. Use the [search()] method; 3. Use the [match()] method.

The operating environment of this tutorial: Windows 7 system, JavaScript version 1.8.5, DELL G3 computer.

Javascript method to determine whether a string contains a certain string:

Method 1: indexOf()

var str = "123";
console.log(str.indexOf("3") != -1 );  // true

## The #indexOf() method returns the position of the first occurrence of a specified string value in a string. If the string value to be retrieved does not appear, the method returns -1.

Method 2: search()

var str = "123";
console.log(str.search("3") != -1 );  // true

The search() method is used to retrieve the specified substring in the string, or to retrieve the substring that matches the regular expression. substring. If no matching substring is found, -1 is returned.

Method 3: match()

var str = "123";
var reg = RegExp(/3/);
if(str.match(reg)){
    // 包含        
}

The match() method can retrieve a specified value within a string, or find a match for one or more regular expressions .

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