js to determine whether a string contains a string of five methods

Method 1: indexOf() (recommended)

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

The indexOf() method returns 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 a specified substring in a string, or to retrieve a substring that matches a regular expression. Returns -1 if no matching substring is found.

Method 3: match()

 var str = "123"; var reg = RegExp(/3/);

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