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並前往https://www.chegg.com/homework-help/questions-and-answers/2-add-second-input-box-b-add-concat-button-modify-javascript-handle-c-add-tosnakecase-butt-q33554973

Solved 2. a) Add a second input box b) Add a concat - Chegg

<p>Enter a String: <input id="inBox" size="50" type="text" /></p> <p> <button id="b1">Length</button>   ... createTextNode('Length = ' + str.length));

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