利用js正則表達式校驗正數(shù)、負數(shù)、和小數(shù)

2020-03-16 20:57:06

字體：大中小

供稿：網(wǎng)友

話不多少，直接附上代碼實例，僅供參考

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head>  <title></title>  <script type="text/javascript">    function validation() {      var val = document.getElementById("txtNumber").value;      var regu = /^(/-|/+)?/d+(/./d+)?$/;      if (val != "") {        if (!regu.test(val)) {          document.getElementById("labResult").style.color = "red";          document.getElementById("labResult").innerHTML = "驗證失敗！";        } else {          document.getElementById("labResult").style.color = "green";          document.getElementById("labResult").innerHTML = "驗證成功！";        }      }    }  </script></head><body>  <input id="txtNumber" name="txtNumber" type="text" />  <input id="btnValidation" name="btnValidation" type="button" value="校驗" onclick="validation()" />  驗證結(jié)果：<label id="labResult" ></label></body></html>

js,正則表達式