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JavaScript Boolean() 方法
tryjsref_boolean_5
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<!DOCTYPE html> <html> <body> <h1>JavaScript Booleans</h1> <h2>The Boolean() Method</h2> <p>Everything Without a value is False</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = Boolean(0) + "<br>" + Boolean(-0) + "<br>" + Boolean("") + "<br>" + Boolean(undefined) + "<br>" + Boolean(null) + "<br>" + Boolean(false) + "<br>" + Boolean(NaN); </script> </body> </html>