problem description

the fields stored in the amount are stored in quantiles. When displayed, separate the last two places with a decimal point 1000 > 10.00

the environmental background of the problems and what methods you have tried

1. < fmt:formatNumber > can operate on decimal points. Do I need to write to the custom pattern attribute if the whole number is converted to a decimal point?
2. use ${fn:substring (str, start, end} to intercept separately, and the decimal point is displayed in the middle.
   2.1 when intercepting, because the length of the amount is not fixed, I need to get the length of the amount first, so the ${fn:length (${orderRooms.price})} method is wrong. What is the reason for writing another ${}?
   2.2 curve first set an object, and ${fn:length (price)} reported an error: Problems calling function "fn:length"
3. can I write a js myself and then call it inline, < I > formatXXX (${orderRooms.price}) < / I > ?

related codes

<c:set var="price"  scope="page" value="${orderRooms.price}"/>
${price}
<c:set var="priceLength" value="${fn:length(price)}" />
<c:set var="pricePrefix" value="${fn:substring(orderRooms.price, 0, priceLength-2)}" />
<c:set var="priceSuffix" value="${fn:substring(orderRooms.price, priceLength-2, priceLength)}" />
${priceLength}--${pricePrefix}--${priceSuffix}
:<i>${orderRooms.price}</i>

what result do you expect? What is the error message actually seen?

the questions of the above three methods hope to be answered;
the end result is that 1000 > 10.00 can also be solved by other methods;