📄 21.html
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<html>
<body>
<script language="JavaScript">
document.write(eval("3+5*2")); document.write("<br>");
document.write(eval("2*3.14*10")); document.write("<hr>");
document.write(parseInt("21")); document.write("<br>");
document.write(parseInt("21",8)); document.write("<br>");
document.write(parseInt("021")); document.write("<br>");
document.write(parseInt("0x21")); document.write("<br>");
document.write(parseInt("456a")); document.write("<br>");
document.write(parseInt("a123")); document.write("<hr>");
document.write(parseFloat("3.14")); document.write("<br>");
document.write(parseFloat("2e3")); document.write("<br>");
document.write(parseFloat("5.67kkk")); document.write("<br>");
document.write(parseFloat("kkk5.67")); document.write("<hr>");
var v1 = parseInt("a123");
document.write(isNaN(v1)); document.write("<br>");
document.write(isNaN(123)); document.write("<br>");
</script>
</body>
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