1 |
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2 | (function (window) { 'use strict';
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3 |
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4 | if (!('firstElementChild' in window.DocumentFragment.prototype)) {
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5 | Object.defineProperty(window.DocumentFragment.prototype, 'firstElementChild', {
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6 | get: function () {
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7 | var node, nodes = this.childNodes, i = 0;
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8 | while (node = nodes[i++]) {
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9 | if (node.nodeType === 1) {
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10 | return node;
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11 | }
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12 | }
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13 | return null;
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14 | }
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15 | });
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16 | }
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17 |
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18 | if (!('children' in window.DocumentFragment.prototype)) {
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19 | Object.defineProperty(window.DocumentFragment.prototype, 'children', {
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20 | get: function () {
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21 | var i = 0, node, nodes = this.childNodes, children = [];
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22 | while (node = nodes[i++]) {
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23 | if (node.nodeType === 1) {
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24 | children.push(node);
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25 | }
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26 | }
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27 | return children;
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28 | }
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29 | });
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30 | }
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31 |
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32 | if (!('lastElementChild' in window.DocumentFragment.prototype)) {
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33 | Object.defineProperty(window.DocumentFragment.prototype, 'lastElementChild', {
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34 | get: function () {
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35 | var node, nodes = this.childNodes, i = nodes.length - 1;
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36 | while (node = nodes[i--]) {
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37 | if (node.nodeType === 1) {
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38 | return node;
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39 | }
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40 | }
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41 | return null;
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42 | }
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43 | });
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44 | }
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45 |
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46 | if (!('childElementCount' in window.DocumentFragment.prototype)) {
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47 | Object.defineProperty(window.DocumentFragment.prototype, 'childElementCount', {
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48 | get: function () {
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49 | var i = 0, count = 0, node, nodes = this.childNodes;
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50 | while (node = nodes[i++]) {
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51 | if (node.nodeType === 1) count++;
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52 | }
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53 | return count;
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54 | }
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55 | });
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56 | }
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57 |
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58 | })(window);
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