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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 正则表达式</h1>
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<p>constructor 函数属性返回创建 RegExp 原型的函数：</p>
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<p id="demo"></p>
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<script>
let pattern = /Hello World/g;
let text = pattern.constructor;
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document.getElementById("demo").innerHTML = text;
</script>
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</body>
</html>
​