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Javascript Style - 如何改变样式可见性

我们想知道如何改变样式可见性。

<!DOCTYPE html>
<html>
<head>
<script type='text/javascript'>
window.onload=function(){
    var countyFieldLabel = document.getElementById('lcity').nextElementSibling;
    countyFieldLabel.style.visibility = "hidden";
}
</script>
</head>
<body>
  <label name="lcity" id="lcity" for="city" class="formLabel" title="City">City:</label>
  <span class=spanclass>*</span>
</body>
</html>