vb script to javascript

Can anyone help me to convert this VB script to equivalent Javascript please.

PMT = ((PV -开发者_运维知识库 FV) * rate/ (1 - (1 + rate) ^ -(nper)))

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Probably

var PMT = ((PV - FV) * rate / (1 - Math.pow(1 + rate, -nper)));

JavaScript numbers are always (at heart) floating-point values, so when you're dealing with money things can get somewhat weird.