//驗證正數和0
var re = /^\d+(?=\.{0,1}\d+$|$)/
//驗證浮點數
?????? var re2=/^(-?\d+)(\.\d+)?$/
???? re.test('0.21');
??? re.test('-0.21');
??? re2.test('-0.21');
var re = /^\d+(?=\.{0,1}\d+$|$)/
//驗證浮點數
?????? var re2=/^(-?\d+)(\.\d+)?$/
???? re.test('0.21');
??? re.test('-0.21');
??? re2.test('-0.21');