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three.js
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		<h1>雾-指数（[name]）</h1>

		<p class="desc">该类所包含的参数定义了指数雾，它可以在相机附近提供清晰的视野，且距离相机越远，雾的浓度随着指数增长越快。</p>

		<h2>代码示例</h2>

		<code>
			const scene = new THREE.Scene();
			scene.fog = new THREE.FogExp2( 0xcccccc, 0.002 );
		</code>

		<h2>构造器</h2>


		<h3>[name]( [param:Integer color], [param:Float density] )</h3>

		<p>颜色参数传入[page:Color]构造函数中，来设置颜色属性。颜色可以是一个十六进制的整型数，或者是CSS风格的字符串。</p>
		<h2>属性</h2>

		<h3>[property:Boolean isFogExp2]</h3>
		<p>
			Read-only flag to check if a given object is of type [name].
		</p>

		<h3>[property:String name]</h3>
		<p>对象的名称，可选、不必唯一。默认值是一个空字符串。</p>

		<h3>[property:Color color]</h3>
		<p>雾的颜色。比如说，如果将其设置为黑色，远处的物体将被渲染成黑色。</p>

		<h3>[property:Float density]</h3>
		<p>定义雾的密度将会增长多块。</p>
		<p>默认值是0.00025.</p>

		<h2>方法</h2>

		<h3>[method:FogExp2 clone]()</h3>
		<p>返回一个具有和当前雾参数相同的新的FogExp2实例。</p>

		<h3>[method:Object toJSON]()</h3>
		<p>以JSON格式返回FogExp2的数据。</p>

		<h2>源代码</h2>

		<p>
			[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
		</p>
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