一、需求描述：如下图，目前有ABC三个维度的评分，每个维度有10个得分区间，客户评分落在1-4区间则等级为E，落在5—8区间则等级为D，落在9-10区间则等级为C，C为对称轴，B和D对称，A和E对称。

说明：E和A形成立体三角，D和B形成立体菱形，C为中轴。

 二、分层分析：以C维为垂直线，AB形成平面，从上往下切割为10层，依次形成10层平面，分别列出10层得分，最后基于10层评分写代码。

第一层：只有EDC

第二层：EDC均向左上角缩进一步

第三层：EDC均继续向左上角缩进一步，此时右下角B已出现。

第四层：EDCB均继续向左上角缩进一步，此时左上角剩1个E，右下角B已出现3个。

 

第五层：EDCB均继续向左上角缩进一步，此时左上角E消失。

 

第六层：DCB均继续向左上角缩进一步。

第七层：DCB均继续向左上角缩进一步，此时右下角A出现。

 第八层：DCBA均继续向左上角缩进一步。

第九层：DCBA均继续向左上角缩进一步，此时D消失。

第十层：CBA均继续向左上角缩进一步。

三、构建矩阵代码 

var scoreA = 445;
var scoreB = 500;
var scoreC = 666;
var scoreLevel = 'C';
if(scoreA==null || scoreA=='' || scoreB==null || scoreB=='' || scoreC==null || scoreC==''){
	return 'C';
}

if(300<=scoreC && scoreC<=565){//第一层（以scoreC为垂直线，形成scoreA x scoreB平面）
	if(300<=scoreB && scoreB<=477){//第一排
		if(300<=scoreA && scoreA<=705){//4E
			scoreLevel = 'E';
		}else if(705<scoreA && scoreA<=817){//4D
			scoreLevel = 'D';
		}else if(817<scoreA && scoreA<=1000){//2C
			scoreLevel = 'C';
		}
	}else if(477<scoreB && scoreB<=551){//第二排
		if(300<=scoreA && scoreA<=678){//3E
			scoreLevel = 'E';
		}else if(678<scoreA && scoreA<=773){//4D
			scoreLevel = 'D';
		}else if(773<scoreA && scoreA<=1000){//3C
			scoreLevel = 'C';
		}
	}else if(551<scoreB && scoreB<=596){//第三排
		if(300<=scoreA && scoreA<=637){//2E
			scoreLevel = 'E';
		}else if(637<scoreA && scoreA<=753){//4D
			scoreLevel = 'D';
		}else if(753<scoreA && scoreA<=1000){//4C
			scoreLevel = 'C';
		}
	}else if(596<scoreB && scoreB<=630){//第四排
		if(300<=scoreA && scoreA<=570){//1E
			scoreLevel = 'E';
		}else if(570<scoreA && scoreA<=737){//4D
			scoreLevel = 'D';
		}else if(737<scoreA && scoreA<=1000){//5C
			scoreLevel = 'C';
		}
	}else if(630<scoreB && scoreB<=657){//第五排
		if(300<=scoreA && scoreA<=705){//4D
			scoreLevel = 'D';
		}else if(705<scoreA && scoreA<=1000){//6C
			scoreLevel = 'C';
		}
	}else if(657<scoreB && scoreB<=687){//第六排
		if(300<=scoreA && scoreA<=678){//3D
			scoreLevel = 'D';
		}else if(678<scoreA && scoreA<=1000){//7C
			scoreLevel = 'C';
		}
	}else if(687<scoreB && scoreB<=713){//第七排
		if(300<=scoreA && scoreA<=637){//2D
			scoreLevel = 'D';
		}else if(637<scoreA && scoreA<=1000){//8C
			scoreLevel = 'C';
		}
	}else if(713<scoreB && scoreB<=759){//第八排
		if(300<=scoreA && scoreA<=570){//1D
			scoreLevel = 'D';
		}else if(570<scoreA && scoreA<=1000){//9C
			scoreLevel = 'C';
		}
	}else if(759<scoreB && scoreB<=900){//第九、十排
		scoreLevel = 'C';
	}
}else if(565<scoreC && scoreC<=585){//第二层
	if(300<=scoreB && scoreB<=477){//第一排
		if(300<=scoreA && scoreA<=678){//3E
			scoreLevel = 'E';
		}else if(678<scoreA && scoreA<=773){//4D
			scoreLevel = 'D';
		}else if(773<scoreA && scoreA<=1000){//3C
			scoreLevel = 'C';
		}
	}else if(477<scoreB && scoreB<=551){//第二排
		if(300<=scoreA && scoreA<=637){//2E
			scoreLevel = 'E';
		}else if(637<scoreA && scoreA<=753){//4D
			scoreLevel = 'D';
		}else if(753<scoreA && scoreA<=1000){//4C
			scoreLevel = 'C';
		}
	}else if(551<scoreB && scoreB<=596){//第三排
		if(300<=scoreA && scoreA<=570){//1E
			scoreLevel = 'E';
		}else if(570<scoreA && scoreA<=737){//4D
			scoreLevel = 'D';
		}else if(737<scoreA && scoreA<=1000){//5C
			scoreLevel = 'C';
		}
	}else if(596<scoreB && scoreB<=630){//第四排
		if(300<=scoreA && scoreA<=705){//4D
			scoreLevel = 'D';
		}else if(705<scoreA && scoreA<=1000){//6C
			scoreLevel = 'C';
		}
	}else if(630<scoreB && scoreB<=657){//第五排
		if(300<=scoreA && scoreA<=678){//3D
			scoreLevel = 'D';
		}else if(678<scoreA && scoreA<=1000){//7C
			scoreLevel = 'C';
		}
	}else if(657<scoreB && scoreB<=687){//第六排
		if(300<=scoreA && scoreA<=637){//2D
			scoreLevel = 'D';
		}else if(637<scoreA && scoreA<=1000){//8C
			scoreLevel = 'C';
		}
	}else if(687<scoreB && scoreB<=713){//第七排
		if(300<=scoreA && scoreA<=570){//1D
			scoreLevel = 'D';
		}else if(570<scoreA && scoreA<=1000){//9C
			scoreLevel = 'C';
		}
	}else if(713<scoreB && scoreB<=900){//第八、九、十排
		scoreLevel = 'C';
	}
}else if(585<scoreC && scoreC<=598){//第三层
	if(300<=scoreB && scoreB<=477){//第一排
		if(300<=scoreA && scoreA<=637){//2E
			scoreLevel = 'E';
		}else if(637<scoreA && scoreA<=753){//4D
			scoreLevel = 'D';
		}else if(753<scoreA && scoreA<=1000){//4C
			scoreLevel = 'C';
		}
	}else if(477<scoreB && scoreB<=551){//第二排
		if(300<=scoreA && scoreA<=570){//1E
			scoreLevel = 'E';
		}else if(570<scoreA && scoreA<=737){//4D
			scoreLevel = 'D';
		}else if(737<scoreA && scoreA<=1000){//5C
			scoreLevel = 'C';
		}
	}else if(551<scoreB && scoreB<=596){//第三排
		if(300<=scoreA && scoreA<=705){//4D
			scoreLevel = 'D';
		}else if(705<scoreA && scoreA<=1000){//6C
			scoreLevel = 'C';
		}
	}else if(596<scoreB && scoreB<=630){//第四排
		if(300<=scoreA && scoreA<=678){//3D
			scoreLevel = 'D';
		}else if(678<scoreA && scoreA<=1000){//7C
			scoreLevel = 'C';
		}
	}else if(630<scoreB && scoreB<=657){//第五排
		if(300<=scoreA && scoreA<=637){//2D
			scoreLevel = 'D';
		}else if(637<scoreA && scoreA<=1000){//8C
			scoreLevel = 'C';
		}
	}else if(657<scoreB && scoreB<=687){//第六排
		if(300<=scoreA && scoreA<=570){//1D
			scoreLevel = 'D';
		}else if(570<scoreA && scoreA<=1000){//9C
			scoreLevel = 'C';
		}
	}else if(687<scoreB && scoreB<=816){//第七、八、九排
		scoreLevel = 'C';
		
	}else if(816<scoreB && scoreB<=900){//第十排
		if(300<=scoreA && scoreA<=861){//9D
			scoreLevel = 'C';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'B';
		}
	}
}else if(598<scoreC && scoreC<=609){//第四层
	if(300<=scoreB && scoreB<=477){//第一排
		if(300<=scoreA && scoreA<=570){//1E
			scoreLevel = 'E';
		}else if(570<scoreA && scoreA<=737){//4D
			scoreLevel = 'D';
		}else if(737<scoreA && scoreA<=1000){//5C
			scoreLevel = 'C';
		}
	}else if(477<scoreB && scoreB<=551){//第二排
		if(300<=scoreA && scoreA<=705){//4D
			scoreLevel = 'D';
		}else if(705<scoreA && scoreA<=1000){//6C
			scoreLevel = 'C';
		}
	}else if(551<scoreB && scoreB<=596){//第三排
		if(300<=scoreA && scoreA<=678){//3D
			scoreLevel = 'D';
		}else if(678<scoreA && scoreA<=1000){//7C
			scoreLevel = 'C';
		}
	}else if(596<scoreB && scoreB<=630){//第四排
		if(300<=scoreA && scoreA<=637){//2D
			scoreLevel = 'D';
		}else if(637<scoreA && scoreA<=1000){//8C
			scoreLevel = 'C';
		}
	}else if(630<scoreB && scoreB<=657){//第五排
		if(300<=scoreA && scoreA<=570){//1D
			scoreLevel = 'D';
		}else if(570<scoreA && scoreA<=1000){//9C
			scoreLevel = 'C';
		}
	}else if(657<scoreB && scoreB<=759){//第六、七、八排
		scoreLevel = 'C';
	}else if(759<scoreB && scoreB<=816){//第九排
		if(300<=scoreA && scoreA<=861){//9C
			scoreLevel = 'C';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'B';
		}		
	}else if(816<scoreB && scoreB<=900){//第十排
		if(300<=scoreA && scoreA<=817){//8C
			scoreLevel = 'C';
		}else if(817<scoreA && scoreA<=1000){//2B
			scoreLevel = 'B';
		}
	}
}else if(609<scoreC && scoreC<=617){//第五层
	if(300<=scoreB && scoreB<=477){//第一排
		if(300<=scoreA && scoreA<=705){//4D
			scoreLevel = 'D';
		}else if(705<scoreA && scoreA<=1000){//6C
			scoreLevel = 'C';
		}
	}else if(477<scoreB && scoreB<=551){//第二排
		if(300<=scoreA && scoreA<=678){//3D
			scoreLevel = 'D';
		}else if(678<scoreA && scoreA<=1000){//7C
			scoreLevel = 'C';
		}
	}else if(551<scoreB && scoreB<=596){//第三排
		if(300<=scoreA && scoreA<=637){//2D
			scoreLevel = 'D';
		}else if(637<scoreA && scoreA<=1000){//8C
			scoreLevel = 'C';
		}
	}else if(596<scoreB && scoreB<=630){//第四排
		if(300<=scoreA && scoreA<=570){//1D
			scoreLevel = 'D';
		}else if(570<scoreA && scoreA<=1000){//9C
			scoreLevel = 'C';
		}
	}else if(630<scoreB && scoreB<=713){//第五、六、七排
		scoreLevel = 'C';
	}else if(713<scoreB && scoreB<=759){//第八排
		if(300<=scoreA && scoreA<=861){//9C
			scoreLevel = 'C';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'B';
		}
	}else if(759<scoreB && scoreB<=816){//第九排
		if(300<=scoreA && scoreA<=817){//8C
			scoreLevel = 'C';
		}else if(817<scoreA && scoreA<=1000){//2B
			scoreLevel = 'B';
		}
	}else if(816<scoreB && scoreB<=900){//第十排
		if(300<=scoreA && scoreA<=773){//7C
			scoreLevel = 'C';
		}else if(773<scoreA && scoreA<=1000){//3B
			scoreLevel = 'B';
		}
	}
}else if(617<scoreC && scoreC<=626){//第六层
	if(300<=scoreB && scoreB<=477){//第一排
		if(300<=scoreA && scoreA<=678){//3D
			scoreLevel = 'D';
		}else if(678<scoreA && scoreA<=1000){//7C
			scoreLevel = 'C';
		}
	}else if(477<scoreB && scoreB<=551){//第二排
		if(300<=scoreA && scoreA<=637){//2D
			scoreLevel = 'D';
		}else if(637<scoreA && scoreA<=1000){//8C
			scoreLevel = 'C';
		}
	}else if(551<scoreB && scoreB<=596){//第三排
		if(300<=scoreA && scoreA<=570){//1D
			scoreLevel = 'D';
		}else if(570<scoreA && scoreA<=1000){//9C
			scoreLevel = 'C';
		}
	}else if(596<scoreB && scoreB<=687){//第四、五、六排
		scoreLevel = 'C';
	}else if(687<scoreB && scoreB<=713){//第七排
		if(300<=scoreA && scoreA<=861){//9C
			scoreLevel = 'C';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'B';
		}
	}else if(713<scoreB && scoreB<=759){//第八排
		if(300<=scoreA && scoreA<=817){//8C
			scoreLevel = 'C';
		}else if(817<scoreA && scoreA<=1000){//2B
			scoreLevel = 'B';
		}
	}else if(759<scoreB && scoreB<=816){//第九排
		if(300<=scoreA && scoreA<=773){//7C
			scoreLevel = 'C';
		}else if(773<scoreA && scoreA<=1000){//3B
			scoreLevel = 'B';
		}
	}else if(816<scoreB && scoreB<=900){//第十排
		if(300<=scoreA && scoreA<=753){//6C
			scoreLevel = 'C';
		}else if(753<scoreA && scoreA<=1000){//4B
			scoreLevel = 'B';
		}
	}
}else if(626<scoreC && scoreC<=635){//第七层
	if(300<=scoreB && scoreB<=477){//第一排
		if(300<=scoreA && scoreA<=637){//2D
			scoreLevel = 'D';
		}else if(637<scoreA && scoreA<=1000){//8C
			scoreLevel = 'C';
		}
	}else if(477<scoreB && scoreB<=551){//第二排
		if(300<=scoreA && scoreA<=570){//1D
			scoreLevel = 'D';
		}else if(570<scoreA && scoreA<=1000){//9C
			scoreLevel = 'C';
		}
	}else if(551<scoreB && scoreB<=657){//第三、四、五排
		scoreLevel = 'C';
	}else if(657<scoreB && scoreB<=687){//第六排
		if(300<=scoreA && scoreA<=861){//9C
			scoreLevel = 'C';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'B';
		}
	}else if(687<scoreB && scoreB<=713){//第七排
		if(300<=scoreA && scoreA<=817){//8C
			scoreLevel = 'C';
		}else if(817<scoreA && scoreA<=1000){//2B
			scoreLevel = 'B';
		}
	}else if(713<scoreB && scoreB<=759){//第八排
		if(300<=scoreA && scoreA<=773){//7C
			scoreLevel = 'C';
		}else if(773<scoreA && scoreA<=1000){//3B
			scoreLevel = 'B';
		}
	}else if(759<scoreB && scoreB<=816){//第九排
		if(300<=scoreA && scoreA<=753){//6C
			scoreLevel = 'C';
		}else if(753<scoreA && scoreA<=1000){//4B
			scoreLevel = 'B';
		}
	}else if(816<scoreB && scoreB<=900){//第十排
		if(300<=scoreA && scoreA<=737){//5C
			scoreLevel = 'C';
		}else if(737<scoreA && scoreA<=861){//4B
			scoreLevel = 'B';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'A';
		}
	}
}else if(635<scoreC && scoreC<=646){//第八层
	if(300<=scoreB && scoreB<=477){//第一排
		if(300<=scoreA && scoreA<=570){//1D
			scoreLevel = 'D';
		}else if(570<scoreA && scoreA<=1000){//9C
			scoreLevel = 'C';
		}
	}else if(477<scoreB && scoreB<=630){//第二、三、四排
		scoreLevel = 'C';
	}else if(630<scoreB && scoreB<=657){//第五排
		if(300<=scoreA && scoreA<=861){//9C
			scoreLevel = 'C';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'B';
		}
	}else if(657<scoreB && scoreB<=687){//第六排
		if(300<=scoreA && scoreA<=817){//8C
			scoreLevel = 'C';
		}else if(817<scoreA && scoreA<=1000){//2B
			scoreLevel = 'B';
		}
	}else if(687<scoreB && scoreB<=713){//第七排
		if(300<=scoreA && scoreA<=773){//7C
			scoreLevel = 'C';
		}else if(773<scoreA && scoreA<=1000){//3B
			scoreLevel = 'B';
		}
	}else if(713<scoreB && scoreB<=759){//第八排
		if(300<=scoreA && scoreA<=753){//6C
			scoreLevel = 'C';
		}else if(753<scoreA && scoreA<=1000){//4B
			scoreLevel = 'B';
		}
	}else if(759<scoreB && scoreB<=816){//第九排
		if(300<=scoreA && scoreA<=737){//5C
			scoreLevel = 'C';
		}else if(737<scoreA && scoreA<=861){//4B
			scoreLevel = 'B';
		}else if(861<scoreA && scoreA<=1000){//1A
			scoreLevel = 'A';
		}
	}else if(816<scoreB && scoreB<=900){//第十排
		if(300<=scoreA && scoreA<=705){//4C
			scoreLevel = 'C';
		}else if(705<scoreA && scoreA<=817){//4B
			scoreLevel = 'B';
		}else if(817<scoreA && scoreA<=1000){//2A
			scoreLevel = 'A';
		}
	}
}else if(646<scoreC && scoreC<=661){//第九层
	if(300<=scoreB && scoreB<=596){//第一、二、三排
		scoreLevel = 'C';
	}else if(596<scoreB && scoreB<=630){//第四排
		if(300<=scoreA && scoreA<=861){//9C
			scoreLevel = 'C';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'B';
		}
	}else if(630<scoreB && scoreB<=657){//第五排
		if(300<=scoreA && scoreA<=817){//8C
			scoreLevel = 'C';
		}else if(817<scoreA && scoreA<=1000){//2B
			scoreLevel = 'B';
		}
	}else if(657<scoreB && scoreB<=687){//第六排
		if(300<=scoreA && scoreA<=773){//7C
			scoreLevel = 'C';
		}else if(773<scoreA && scoreA<=1000){//3B
			scoreLevel = 'B';
		}
	}else if(687<scoreB && scoreB<=713){//第七排
		if(300<=scoreA && scoreA<=753){//6C
			scoreLevel = 'C';
		}else if(753<scoreA && scoreA<=1000){//4B
			scoreLevel = 'B';
		}
	}else if(713<scoreB && scoreB<=759){//第八排
		if(300<=scoreA && scoreA<=737){//5C
			scoreLevel = 'C';
		}else if(737<scoreA && scoreA<=861){//4B
			scoreLevel = 'B';
		}else if(861<scoreA && scoreA<=1000){//1A
			scoreLevel = 'A';
		}
	}else if(759<scoreB && scoreB<=816){//第九排
		if(300<=scoreA && scoreA<=705){//4C
			scoreLevel = 'C';
		}else if(705<scoreA && scoreA<=817){//4B
			scoreLevel = 'B';
		}else if(817<scoreA && scoreA<=1000){//2A
			scoreLevel = 'A';
		}
	}else if(816<scoreB && scoreB<=900){//第十排
		if(300<=scoreA && scoreA<=678){//3C
			scoreLevel = 'C';
		}else if(678<scoreA && scoreA<=773){//4B
			scoreLevel = 'B';
		}else if(773<scoreA && scoreA<=1000){//3A
			scoreLevel = 'A';
		}
	}
}else if(661<scoreC && scoreC<=900){//第十层
	if(300<=scoreB && scoreB<=596){//第一、二、三排
		scoreLevel = 'C';
	}else if(596<scoreB && scoreB<=630){//第四排
		if(300<=scoreA && scoreA<=861){//9C
			scoreLevel = 'C';
		}else if(861<scoreA && scoreA<=1000){//1B
			scoreLevel = 'B';
		}
	}else if(630<scoreB && scoreB<=657){//第五排
		if(300<=scoreA && scoreA<=817){//8C
			scoreLevel = 'C';
		}else if(817<scoreA && scoreA<=1000){//2B
			scoreLevel = 'B';
		}
	}else if(657<scoreB && scoreB<=687){//第六排
		if(300<=scoreA && scoreA<=773){//7C
			scoreLevel = 'C';
		}else if(773<scoreA && scoreA<=1000){//3B
			scoreLevel = 'B';
		}
	}else if(687<scoreB && scoreB<=713){//第七排
		if(300<=scoreA && scoreA<=753){//6C
			scoreLevel = 'C';
		}else if(753<scoreA && scoreA<=1000){//4B
			scoreLevel = 'B';
		}
	}else if(713<scoreB && scoreB<=759){//第八排
		if(300<=scoreA && scoreA<=737){//5C
			scoreLevel = 'C';
		}else if(737<scoreA && scoreA<=861){//4B
			scoreLevel = 'B';
		}else if(861<scoreA && scoreA<=1000){//1A
			scoreLevel = 'A';
		}
	}else if(759<scoreB && scoreB<=816){//第九排
		if(300<=scoreA && scoreA<=705){//4C
			scoreLevel = 'C';
		}else if(705<scoreA && scoreA<=817){//4B
			scoreLevel = 'B';
		}else if(817<scoreA && scoreA<=1000){//2A
			scoreLevel = 'A';
		}
	}else if(816<scoreB && scoreB<=900){//第十排
		if(300<=scoreA && scoreA<=678){//3C
			scoreLevel = 'C';
		}else if(678<scoreA && scoreA<=773){//4B
			scoreLevel = 'B';
		}else if(773<scoreA && scoreA<=1000){//3A
			scoreLevel = 'A';
		}
	}
}
return scoreLevel;