lodash sortBy的用法

数组对象：

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var tags = [ 
		{ name: 'php', post_count: 2 },
		{ name: 'html', post_count: 3 },
		{ name: 'lua', post_count: 5 },
		{ name: 'css', post_count: 2 },
		{ name: 'python', post_count: 2 },
		{ name: 'javascript', post_count: 1 },
		{ name: 'express', post_count: 4 },
		{ name: 'css3', post_count: 6 },
		{ name: 'mongoose', post_count: 0 } 
	]

以post_count升序排序：

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tags = _.sortBy(tags, function(item){
			return item.post_count;
		});

以post_count降序排序，排序项加个负号：

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tags = _.sortBy(tags, function(item){
			return -item.post_count;
		});