You have to return the result of the condition so Array.findIndex knows if the value was found or not ['kk', 'll', 'mm', 'pp']. ... <看更多>

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>

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>

JavaScript 中使用substr、substring、indexOf、lastIndexOf 等擷取字串方式。 substr. substr ( start , length ) 表示從start 位置開始，擷取length ... ... <看更多>

Learn how you can Input a String from keyboard. Details on indexOf and substring method Next Video ... ... <看更多>

sashak007/JavaScript Implementation of indexOf string. Created 6 years ago ... function indexOf(str, query) {. for(var i = 0; i < str.length; i++) {. ... <看更多>