实例代码“Ctrl+/”提示“F11/ESC”全屏 返回 格式化 恢复 运行
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<html><!DOCTYPE html>
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<html>
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<head>
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<script>
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function showHint(str)
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{
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var xmlhttp;
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if (str.length==0)
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  {
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  document.getElementById("txtHint").innerHTML="";
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  return;
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  }
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if (window.XMLHttpRequest)
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  {// code for IE7+, Firefox, Chrome, Opera, Safari
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  xmlhttp=new XMLHttpRequest();
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  }
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else
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  {// code for IE6, IE5
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  xmlhttp=new ActiveXObject("Microsoft.XMLHTTP");
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  }
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xmlhttp.onreadystatechange=function()
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  {