<!DOCTYPE html>
<html>
<body>
<h2>JavaScript 数字</h2>
<p>减法时，JavaScript 会尝试将字符串转换为数字：</p>
<p id="demo"></p>
<script>
var x = "100";
var y = "10";
var z = x - y;
document.getElementById("demo").innerHTML = z;
</script>
</body>
</html>
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