js rounding problem of special data_basic knowledge

JS rounding problem of special data

2.885

7131.0

两数相乘：20572.934999999998

四舍五入后结果是：20572.93

What’s going on?

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]

A better solution:

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]<script> var s = 2, n = 20572.934999999998; var l = n.toString().length - (n.toString().indexOf('.') + 1); for (var i = l; i >= s; i --) { n = new Number(n.toFixed(i)); } alert(n); </script>