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<!DOCTYPE html>
<html>
<body>
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<h1>JavaScript 数组方法</h1> 
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<h2>concat()</h2>
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<p>concat() 方法用于合并（连接）数组：</p>
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<p id="demo"></p>
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<script>
var arr1 = ["Emma", "Isabella"];
var arr2 = ["Jacob", "Michael", "Ethan"];
var arr3 = ["Joshua", "Daniel"];
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var myChildren = arr1.concat(arr2, arr3); 
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document.getElementById("demo").innerHTML = myChildren;
</script>
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</body>
</html>
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