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代码编辑器：

<!DOCTYPE html>
<meta charset="utf-8">
<link href="/static/next/css/tryit.css?v=2017082407" rel="stylesheet"/>
<script src="https://cdn.staticfile.org/jquery/2.2.4/jquery.min.js"></script>
 
<div id="log"></div>
<script>
$(function () { 
	var defaults = { validate: false, limit: 5, name: "foo" };
	var options = { validate: true, name: "bar" }; 
	/*合并默认值和选项，不修改默认对象。*/
	var settings = $.extend({}, defaults, options); 
	var printObj = typeof JSON != "undefined" ? JSON.stringify : function(obj) {
		var arr = [];
		$.each(obj, function(key, val) {
			var next = key + ": ";
			next += $.isPlainObject(val) ? printObj(val) : val;
			arr.push( next );
		});
		return "{ " +  arr.join(", ") + " }";
	};
	$("#log").append( "<div><b>defaults -- </b>" + printObj(defaults) + "</div>" );
	$("#log").append( "<div><b>options -- </b>" + printObj(options) + "</div>" );
	$("#log").append( "<div><b>settings -- </b>" + printObj(settings) + "</div>" );
})
</script>
 
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代码编辑器：

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