JavaScriptからAmazon Product Advertising APIを叩くときのサンプルです。URLの構築まで（後はajaxでGETで飛ばせば結果が得られる）。CryptoJSとjQueryに依存してます。

AmazonProductAdvertisingAPI-JavaScriptExample.js

	// Your Access Key ID, as taken from the Your Account page
	var access_key_id = ""; // TODO　埋める

	// Your Secret Key corresponding to the above ID, as taken from the Your Account page
	var secret_key = ""; // TODO 埋める

	// The region you are interested in
	var endpoint = "webservices.amazon.co.jp";

	var uri = "/onca/xml";

	/**
	 * 検索条件
	 *
	 * 以下、参考になるドキュメント
	 * ■概要
	 * https://images-na.ssl-images-amazon.com/images/G/09/associates/paapi/dg/index.html
	 
	 * ■SearchIndex(検索カテゴリ)の一覧
	 * https://images-na.ssl-images-amazon.com/images/G/09/associates/paapi/dg/index.html?APPNDX_SearchIndexParamForItemsearch.html
	 * 
	 * ■Sort(並び替え)の一覧
	 * ※SearchIndex毎に使える並び替え条件が異なる
	 * https://images-na.ssl-images-amazon.com/images/G/09/associates/paapi/dg/index.html?APPNDX_SortValuesArticle.html
	 */
	var params = {
		"Service" : "AWSECommerceService",
		"Operation" : "ItemSearch", // 商品を検索する
		"AWSAccessKeyId" : access_key_id,
		"AssociateTag" : "", // TODO 埋める
		"SearchIndex" : "Music", // 検索カテゴリ
		"Keywords" : "keyword", // 検索ワード
		"Sort" : "-orig-rel-date", // 並び替え
		"ResponseGroup" : "Images,ItemAttributes,Offers"
	};

	// Set current timestamp if not set
	if (params["Timestamp"] == undefined) {
		params["Timestamp"] = new Date().toISOString().slice(0, -5);
	}
	
	var pairs = [];
	
	// パラメータをアルファベット昇順に並び替え＆key=value形式の文字列に変換＆URLエンコード
	$.each(Object.keys(params).sort(), function() {
		var key = this;
		var value = params[key];
		pairs.push(encodeURIComponent(key) + "=" + encodeURIComponent(value));
	});

	// Generate the canonical query
	var canonical_query_string = pairs.join('&');

	// Generate the string to be signed
	var string_to_sign = "GET\n" + endpoint + "\n" + uri + "\n" + canonical_query_string;

	// Generate the signature required by the Product Advertising API
	var signature = CryptoJS.HmacSHA256(string_to_sign, secret_key).toString(CryptoJS.enc.Base64);

	// Generate the signed URL
	var request_url = 'http://'+endpoint+uri+'?'+canonical_query_string+'&Signature='+encodeURIComponent(signature);