Javascript写成绩排序方法1 if else 方法2 switch

Love The Way You Lie 2021-09-15 15:14 479阅读 0赞

<!DOCTYPE html>
    <html lang="zh-CN">
    <head>
    	<meta charset="UTF-8">
    	<title>成绩分类</title>
    </head>
    <body>
    	请输入成绩:<input type="text"><br>
    	<input type="button" value="确认">
    </body>
    <script>
    	//分数大于90是优秀,在70到90之间是良好,60到70之间及格,60分一下是不及格
    
        var inps =document.querySelectorAll("input");
        inps[1].onclick = function(){
        	var score = Number(inps[0].value);
    
    
        	if(score>100|| score<0){
        		alert("考了一个假试吧!")
        	}else{
        		if(score >= 90){
        		alert("优秀");
        		}else if(score>=70){
        		alert("良好");
        		}else if(score>=60){
        		alert("及格");
        		}else{
        		alert("不及格");
        		}
        	}
    
        	
          var level;
            if(score>=90&&score<=100){
            	level=1;
            }
            if(score>=70 && score<90){
            	level=2;
            }
            if(score>=60 && score<70){
            	level=3;
            }
            if(score<60 && score>0){
            	level=4;
            }
           
           switch (level){
           		case 1:
           		alert("优秀");
           	 	break; 
           	 	case 2:
           	 	alert("良好");
           	 	break;
           	 	case 3:
           	 	alert("及格");
           	 	break;
           	 	case 4:
           	 	alert("不及格");
           	 	break;
           	 	default:
           	 	alert("假成绩");
           	 	break;
           }
    
    
          var level = parseInt(score/10);
          switch (level){
            case 10:
            alert("优");
            break;
            case 9:
            alert("优");
            break;
            case 8:
            alert("良");
            break;
            case 7:
            alert("良");
            break;
            case 6:
            alert("及格");
            break;
            case 5:
            alert("不及格");
            break;
            case 4:
            alert("不及格");
            break;
            case 3:
            alert("不及格");
            break;
            case 2:
            alert("不及格");
            break;
            case 1:
            alert("不及格");
            break;
           default:
           alert("考了一个假试吧");
           break;
          }
        }
    
    </script>
    </html>

![70][]

[70]: /images/20210813/9a8e8abc56fa444891340d2649704147.png