<!DOCTYPE html>
<html>
<body>
<p>单击按钮显示负无穷大。</p>
<button onclick="myFunction()">试一试</button>
<p id="demo"></p>
<script>
function myFunction() {
document.getElementById("demo").innerHTML = Number.NEGATIVE_INFINITY;
}
</script>
</body>
</html>
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