[JavaScript知识库]JavaScript判断学生及格区间（表驱动法）

	// 学生及格区间
		const keys = ['A','B','C','D','Default'],
		      range = [90,80,70,60,0];
					
		const judge = (score) => {
			const len = range.length;
			
			for(let i = 0;i < len;i++){
				if(score >= range[i]){
					return keys[i];
				}
			}
		}
		const fun = {
			'A':() => '优秀',
			'B':() => '良好',
			'C':() => '中等',
			'D':() => '及格',
			'Default':() => {'不及格'},
		}
		console.log(fun[judge(100)]())
		

if、switch

	     int score = 90;
			if(score >= 90){
			   Text = "优秀";
			}
			else if (score >= 80 && score < 90) {
			   Text = "良好";
			}else if(score >=70 && score<80){
			   Text = "中等";
			}else if (score >=60 && score<70){
			   Text = "及格";
			}else{
			   Text = "不及格";
			}

			switch(score / 10){
			case 10:
				Text = "优秀";break;
			case 9:
				Text = "优秀";break;
			case 8:
				Text = "良好";break;
			case 7:
				Text = "中等";break;
			case 6:
				Text = "及格";break;
			default:
				Text = "不及格";break;
			
			}