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JavaScript Set集合 isSubsetOf() 方法
tryjsref_set_is_subset_of
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<!DOCTYPE html> <html> <body> <h1>JavaScript Sets</h1> <h2>The isSubsetOf() Method</h2> <p>The isSubsetOf() method returns true if all elements in this set is also elements in the argument set:</p> <p id="demo"></p> <script> const A = new Set(['a','b','c']); const B = new Set(['b','c','d']); let answer = A.isSubsetOf(B); document.getElementById("demo").innerHTML = answer; </script> </body> </html>