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JavaScript new Set 新集合方法
tryjsref_set_create_array
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<!DOCTYPE html> <html> <body> <h1>JavaScript Sets</h1> <p>Create a set from an array:</p> <p id="demo"></p> <script> // Create a Set const letters = new Set(["a","b","c"]); // Display set.size document.getElementById("demo").innerHTML = "The new set has " + letters.size + " values."; </script> </body> </html>