html中如何美化展示json格式数据

<h2>GeoJsonTxt示例如下：</h2>
	<p>
	    <h4>注意：示例中<span style="color:red">features,geometry,coordinates,properties,name,description</span>字段是必须有的，
	        字段名称不能改变，需要扩展的字段可以在<span style="color:red">properties</span>里面自行添加</h4>
	</p>
	<pre id="geoJsonTxt">
	</pre>

function showGeoJsonTxt(){
	$('#geoJsonTxt').html(JsonFormat());
}

function JsonFormat() {
	var json={
			  "type": "FeatureCollection",
			  "features": [
			    {
			      "type": "Feature",
			      "geometry": {
			        "type": "Point",
			        "coordinates": [
			          123,
			          22,
			          0
			        ]
			      },
			      "properties": {
			        "name": "必须有的字段",
			        "description": "必须有的字段",
					"age":"扩展字段，可以自行添加，扩展",
					"type":"扩展字段，可以自行添加，扩展"
			      }
			    },
				{
			      "type": "Feature",
			      "geometry": {
			        "type": "Point",
			        "coordinates": [
			          123,
			          32,
			          0
			        ]
			      },
			      "properties": {
			        "name": "必须有的字段",
			        "description": "必须有的字段",
			      }
			    }
			  ]
			};
	if (typeof json != 'string') {
		json = JSON.stringify(json, undefined, 2);
	}
		json = json.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
		return json.replace(/("(\\u[a-zA-Z0-9]{4}|\\[^u]|[^\\"])*"(\s*:)?|\b(true|false|null)\b|-?\d+(?:\.\d*)?(?:[eE][+\-]?\d+)?)/g, function (match) {
			 var cls = 'number';
			 	if (/^"/.test(match)) {
			 			if (/:$/.test(match)) {
			 				cls = 'key';
			 			} else {
			 				cls = 'string';
			 			}
			 	} else if (/true|false/.test(match)) {
			 		cls = 'boolean';
			 	} else if (/null/.test(match)) {
			 		cls = 'null';
			 	}
			 	return '<span class="' + cls + '">' + match + '</span>';
		 });
}

<style>
 pre {outline: 1px solid #ccc; padding: 5px; margin: 5px; }
 .string { color: green; }
 .number { color: darkorange; }
 .boolean { color: blue; }
 .null { color: magenta; }
 .key { color: red; }
</style>