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JavaScript Boolean() 方法
tryjsref_boolean_4
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<!DOCTYPE html> <html> <body> <h1>JavaScript Booleans</h1> <h2>The Boolean() Method</h2> <p>Everything With a value is True</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = Boolean(100) + "<br>" + Boolean(3.14) + "<br>" + Boolean(-15) + "<br>" + Boolean("Hello") + "<br>" + Boolean('false') + "<br>" + Boolean(1 + 7 + 3.14); </script> </body> </html>