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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数字</h1>
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<h2>toLocaleString() 方法</h2>
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<p>toLocaleString() 使用本地语言格式将数字以字符串返回。</p>
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<p>options 参数（对象）描述了格式：</p>
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<p id="demo"></p>
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<script>
let num = 1000000;
let text = num.toLocaleString("en-US", {style:"currency", currency:"USD"});
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document.getElementById("demo").innerHTML = text;
</script>
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</body>
</html>
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