​x
 
<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数字</h1>
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<p>在相加时，JavaScript 不会把字符串转换为数字：</p>
​
<p id="demo"></p>
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<script>
var x = "100";
var y = "10";
var z = x + y;   
document.getElementById("demo").innerHTML = z;
</script>
​
</body>
</html>
​