chrome extend

manifest.json

{
    "name" : "AmazonWishlistPriceSum",
    "version" : "2.0.0",
    "manifest_version" : 2,
    "description" : "アマゾンのウィッシュリスト内のアイテムの合計の値段を表示するやつ",
    "content_scripts" : [
        {
            "matches" : [
                    "https://www.amazon.co.jp/gp/registry/wishlist/*",
                    "https://www.amazon.co.jp/registry/wishlist/*",
                    "https://www.amazon.co.jp/hz/wishlist/ls/*"
            ],
            "js" : ["script.js"]
        }
    ]
}

script.js

(function(){
	"use strict";
	const section = "div.price-section span span.a-offscreen"
	const name = "#profile-list-name"

	let sum = 0;
	let prices = document.querySelectorAll(section);

	for(let value of prices.values()){
		if(value !== null){
			const price = value.innerHTML.replace(/[^-^0-9^\.]/g,"");
			sum += (price === '') ? 0 : parseInt(price,10);
		}
	}
	
	console.log("合計金額:"+sum+"円");
	let parent = document.querySelector(".a-container");
	let listname = document.querySelector(name);
	let displabel = document.createElement("h2");	

	let pages = document.querySelector(".a-pagination");

	let page = (pages === null) ? 1 : document.querySelector("li.a-selected").firstChild.innerHTML;

	displabel.innerHTML = " [" + page + "ページ目の合計金額 : " + sum + "円]";
	listname.innerHTML += displabel.innerHTML;
}());