substr / substring 和indexOf / lastIndexOf 等擷取字串用法 ... JavaScript 中使用substr、substring、indexOf、lastIndexOf 等擷取字串方式。 substr. ... <看更多>

The video looks at the method indexOf from the String class. It shows what is returned with indexOf if an item is or is not found within a ... ... <看更多>

indexOf () that takes a regular expression instead of a string for the first first parameter while still allowing a second parameter ? I need to do something ... ... <看更多>