javascript中如何使浮点数保留固定的小数位数？

Question

<script>
var test=8.8888
Number.prototype.fixed=function(n){
with(Math)return round(Number(this)*pow(10,n))/pow(10,n)
}
alert(test.fixed(2))
alert(test.toFixed(2))//ie5.5+
</script>

Answer 1

<script language="JavaScript">var test=10/3;
Number.prototype.fixed=function(n){
with(Math)return round(Number(this)*pow(10,n))/pow(10,n)
}
alert(test.fixed(2))
alert(test.toFixed(2))//ie5.5+ </script>

Answer 2

加个判断<SCRIPT LANGUAGE="JavaScript">
if(!Number.prototype.toFixed) {
Number.prototype.toFixed = function(n) {
with(Math) return round(Number(this)*pow(10,n))/pow(10,n)
}
}
alert(8.88888.toFixed(2))
</SCRIPT>