js値参照とアドレス参照

		var m = 1000;
		var n = m;
		n++;
		console.log(n);	// 1001
		console.log(m); // 1000

		var str = "qwer";
		var newstr = str;
		newstr += "tyu";
		console.log(newstr); // qwertyu
		console.log(str);	 // qwer

		var bool = true;
		var newbool = bool;
		newbool = false;
		console.log(newbool); // false
		console.log(bool);	  // true

		var arr = [1,2,3,4,5];
		var newarr = arr;
		var y = newarr.splice(1,3);
		console.log(y);		 // [2, 3, 4]
		console.log(newarr); // [1, 5]
		console.log(arr);	 // [1, 5]

		var arr = [1,2,3,4,5];
		var newarr = [];
		for(var x in arr){
			newarr.push(arr[x]);
		}
		var y = newarr.splice(1,3);
		console.log(y); 	 // [2, 3, 4]
		console.log(newarr); // [1, 5]
		console.log(arr); 	 // [1, 2, 3, 4, 5]

		var obj = {"name":"zhangsan","age":10,"sex":"nan"};
		var newobj = obj;
		newobj.name = "lisi";
		console.log(newobj); // {name: "lisi", age: 10, sex: "nan"}
		console.log(obj);	 // {name: "lisi", age: 10, sex: "nan"}

		var obj = {"name":"zhangsan","age":10,"sex":"nan"};
		for(var x in obj){
			newobj[x] = obj[x];
		}
		newobj.name = "lisi";
		console.log(newobj); // {name: "lisi", age: 10, sex: "nan"}
		console.log(obj);	 // {name: "zhangsan", age: 10, sex: "nan"}