firstChild这个属性是不是废除了？
firstChild这个属性是不是废除了？

[解决办法]

JScript code

function checkDate() {if (!document.getElementById || !document.createTextNode) {  return;}var dateField = document.getElementById("date");if (!dateField) {  return;}var errorContainer = dateField.parentNode.getElementsByTagName("span")[0];if (!errorContainer) {  return; }var checkPattern = new RegExp("\\d{2}/\\d{2}/\\d{4}");var errorMessage = "";errorContainer.innerHTML = '';var dateValue = dateField.value; if (dateValue == "") {  errorMessage = "Plaese provide a date.";}else if (!checkPattern.test(dateValue)) {  errorMessage = "Pleaes provid the date in the defined format";}if (errorMessage != "") {  errorContainer.innerHTML = errorMessage;   dateField.focus();  return false;} else {  return true;}}