Result Size: 625 x 534
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<!DOCTYPE html>
<html>
<body>
<p>单击该按钮可显示指定 unicode 编号的字符。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
  var res = String.fromCharCode(65);
  document.getElementById("demo").innerHTML = res;
}
</script>
</body>
</html>