科学记数法


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<!DOCTYPE html>
<html>

<head>
<meta charset="UTF-8">
<title>科学记数法</title>
</head>

<body>
</body>

</html>
<script>
// var x=3.145e2
var x = 0.1
var y = 0.2
document.write(x + y) // 0.30000000000000004
</script>