Add an article about development environment for Leaflet.js.

content/labs/leaflet-js-mapbox-js/002-setup-dev-environment.md

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+title = "JavaScriptではじめるWebマップアプリケーション: Chapter2-1"
+date = 2019-05-01T19:06:46+08:00
+Description = "JavaScriptではじめるWebマップアプリケーションの内容を淡々と試してみます。"
+Categories = ["Leaflet.js"]
++++
+
+『[JavaScriptではじめるWebマップアプリケーション \(PDF版\)](https://booth.pm/ja/items/1314906)』の内容を淡々と試してみます。まずは`Leaflet.js`で地図を表示してみます:
+
+<div id="leaflet-map"></div>
+
+<style type="text/css">
+<!--
+#leaflet-map { height: 600px; }
+-->
+</style>
+
+<script src="https://unpkg.com/leaflet@1.3.4/dist/leaflet.js"></script>
+<link href="https://unpkg.com/leaflet@1.3.4/dist/leaflet.css" rel="stylesheet">
+
+<script>
+// MIERUNE MONO読み込み
+let m_mono = new L.tileLayer("https://tile.mierune.co.jp/mierune_mono/{z}/{x}/{y}.png", {
+attribution: "Maptiles by <a href='http://mierune.co.jp/' target='_blank'>MIERUNE</a>, under CC BY. Data by <a href='http://osm.org/copyright' target='_blank'>OpenStreetMap</a> contributors, under ODbL."
+});
+
+// Map読み込み
+let map = L.map("leaflet-map", {
+center: [35.6810,139.7670],
+zoom: 14,
+layers: [m_mono]
+});
+</script>
+
+## コード
+このような形になります:
+
+```
+<div id="leaflet-map"></div>
+
+<style type="text/css">
+<!--
+#leaflet-map { height: 600px; }
+-->
+</style>
+
+<script src="https://unpkg.com/leaflet@1.3.4/dist/leaflet.js"></script>
+<link href="https://unpkg.com/leaflet@1.3.4/dist/leaflet.css" rel="stylesheet">
+
+<script>
+// MIERUNE MONO読み込み
+let m_mono = new L.tileLayer("https://tile.mierune.co.jp/mierune_mono/{z}/{x}/{y}.png", {
+attribution: "Maptiles by <a href='http://mierune.co.jp/' target='_blank'>MIERUNE</a>, under CC BY. Data by <a href='http://osm.org/copyright' target='_blank'>OpenStreetMap</a> contributors, under ODbL."
+});
+
+// Map読み込み
+let map = L.map("leaflet-map", {
+center: [35.6810,139.7670],
+zoom: 14,
+layers: [m_mono]
+});
+</script>
+```