kakaku.com.js

var main = function(){

if((location.hostname === "s.kakaku.com") || (location.hostname === "m.kakaku.com"))
	return alert("PC表示でご利用ください。");
if(location.hostname !== "kakaku.com")
	return alert("ドメインが'kakaku.com'ではありません。");
if(location.pathname.search(/item/) === -1)
	return alert("商品ページでご利用ください。");

if(set)
	return setItem();
if(get)
	return getItem();
if(rm)
	return rmItem();

}

main();

function setItem(){

	var select = function(){
		for(var i=1;i<=100;i++)
			if(!(location.pathname+i in window.localStorage))
				return location.pathname+i;
	}

	var category = "[" + document.getElementsByClassName("path btmPath")[0].getElementsByTagName("a")[2].getElementsByTagName("span")[0].innerHTML + "]";
	var title = document.getElementById("titleBox").getElementsByTagName("h2")[0].innerHTML;
	var price = document.getElementById("minPrice").getElementsByTagName("span")[0].innerHTML;
	var obj = {category:category,title:title,price:price};
	window.localStorage.setItem(select(),JSON.stringify(obj));

	getItem();

}

function getItem(){

	var str = "";
	var sum = 0;
	for(key in window.localStorage){
		if(key.search(/item/) >= 0){
			var obj2 = JSON.parse(window.localStorage.getItem(key));
			for(key2 in obj2){
				str += obj2[key2] + " ";
				if(key2 === "price")
					sum += Number(obj2[key2].slice(1).replace(",",""));
			}
			str += "\n";
		}
	}
	str += "合計" + "   " + "\\" + String(sum).replace(/(\d)(?=(\d\d\d)+(?!\d))/g,'$1,');
	alert(str);

}

function rmItem(){

	var flag = true;
	var res = window.prompt("削除したいアイテムの文字列を指定してください。（一部でも可）\n（すべての場合は'all'を指定）","all");
	for(key in window.localStorage){
		if(key.search(/item/) >= 0){
			if(res.search(/all/i) === 0){
				window.localStorage.removeItem(key);
			}else if(flag){
				var obj2 = JSON.parse(window.localStorage.getItem(key));
				for(key2 in obj2){
					if(obj2[key2].search(res) >= 0){
						window.localStorage.removeItem(key);
						flag = false;
					}
				}
			}
		}
	}

	getItem();

}