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JavaScript Set 集合方法
tryjs_set_keys2
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<!DOCTYPE html> <html> <body> <h1>JavaScript Sets</h1> <h2>The keys() Method</h2> <p>The keys() method returns a Set Iterator with all the values from a Set.</p> <p id="demo"></p> <script> // Create a Set const letters = new Set(["a","b","c"]); // List all Elements let text = ""; for (const x of letters.keys()) { text += x + "<br>"; } document.getElementById("demo").innerHTML = text; </script> </body> </html>