The indexOf() returns the index of the first occurrence of a substring in a string, or -1 if the string does not contain the substring. · The indexOf() is case- ... ... <看更多>

There's a second parameter which controls the starting position of search: String.prototype.indexOf(arg, startPosition);. So you can do str. ... <看更多>

Implementation of the String Prototype indexOf method in Vanilla Javascript. - GitHub - devictoribero/implementation-prototype-string-indexof: ... ... <看更多>

Javascript indexOf () String - Get the position of a specified value within a string. ... String.prototype ... ... <看更多>

JavaScript String indexOf. Ever want to find something in one of your JavaScript strings? Maybe even start your search halfway through the string? ... <看更多>