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>

I think the more important question is "why does JavaScript have both a substr method and a substring method"? This is really the preferred ... ... <看更多>

indexOf() returns the index of the first occurrence of substring ( substr ) in a string ( str ):. let index = str.indexOf(substr, [, fromIndex]);. ... <看更多>

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