日期正则

function isValidDate(sText) {

        var reDate = /(?:0[1-9]|[12][0-9]|3[01])\/(?:0[1-9]|1[0-2])\/(?:19|20\d{2})/;

        return reDate.test(sText);

}

    function validate() {

        var oInput1 = document.getElementById("txt1");

        if (isValidDate(oInput1.value)) {

            alert("Valid");

        } else {

            alert("Invalid!");

        }

 

    }