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JavaScript 布尔运算符
tryjs_boolean
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<!DOCTYPE html> <html> <body> <p id="demo"></p> <script> var b1 = Boolean(100); var b2 = Boolean(3.14); var b3 = Boolean(-15); var b4 = Boolean("Hello"); var b5 = Boolean('false'); var b6 = Boolean(1 + 7 + 3.14); document.getElementById("demo").innerHTML = "100 is " + b1 + "<br>" + "3.14 is " + b2 + "<br>" + "-15 is " + b3 + "<br>" + "Any (not empty) string is " + b4 + "<br>" + "Even the string 'false' is " + b5 + "<br>" + "Any expression (except zero) is " + b6; </script> </body> </html>