同步pear admin layui

static/admin/Pear-Admin-Layui-3.11.1/component/pear/module/convert.js

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+layui.define(['jquery', 'element'], function(exports) {
+	"use strict";
+
+	/**
+	 * 类 型 转 换 工 具 类
+	 * */
+	var MOD_NAME = 'convert',
+		$ = layui.jquery,
+		element = layui.element;
+
+	var convert = new function() {
+
+		// image 转 base64
+		this.imageToBase64 = function(img) {
+			var canvas = document.createElement("canvas");
+			canvas.width = img.width;
+			canvas.height = img.height;
+			var ctx = canvas.getContext("2d");
+			ctx.drawImage(img, 0, 0, img.width, img.height);
+			var ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();
+			var dataURL = canvas.toDataURL("image/"+ext);
+			return dataURL;
+		}
+
+	}
+	exports(MOD_NAME, convert);
+});