concat()方法怎么用

Object.concat(value1,value2,......,valueX)

<script type="text/javascript">
var arr = new Array(3)
arr= ["George","John","Thomas"];
var arr2 = new Array(3);
arr2=["James","Adrew","Martin"];
var arr3 = new Array(2)
arr3 = ["William","Franklin"]
console.log(arr.concat(arr2,arr3));
console.log(arr);
</script>

<script type="text/javascript">
var arr = new Array(3)
arr= [1,7,3];
var arr2 = new Array(3);
arr2=[2,3,5];
var arr3 = new Array(2)
arr3 = [4,5,6]
console.log(arr.concat(arr2,arr3));
console.log(arr);
</script>

<script type="text/javascript">
var arr = "dsfjh";
var arr2 = "PHP";
var arr3 = "中文网！"
console.log(arr.concat(arr2,arr3));
console.log(arr);
</script>