js中为何在输入后声明对象后便无法正常显示输入框


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var fan=prompt("投喂的量");
        var howfar=prompt("奔跑的距离");
        var person={
            name="dsm",
            age=30,
            weight=120,
            eat:function(x){
                if(x>=0)
                {
                weight=weight+x;
                }
                else{alert("喝西北风");}
                if(weight<80){alert("瘦到不正常");}
                if(weight>=80&&weight<100){alert("偏瘦")}
                if(weight>=100&&weight<145){alert("正常");}
                if(weight>=145){alert("太胖了");}
                return 0;   
            },
            run:function(distance){
                if(distance<1000){alert("有点吃力");}
                if(distance>=1000&&distance<2000){alert("折磨");}
                if(distance>2000){alert("原地去世");}
                return 0;
            }
        }
        person.eat(fan);
        person.run(howfar);
    </script>
</body>
</html>

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1条回答默认最新

CSDN专家-Fay 2021-08-21 08:34

关注

对象属性名和值之间用冒号，还有未定义weight，帮你改好了：
如有帮助请在我的回答上点个【采纳】，谢谢！

 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <script>
        var fan=prompt("投喂的量");
        var howfar=prompt("奔跑的距离");
        var weight;
        var person={
            name:"dsm",
            age:30,
            weight:120,
            eat:function(x){
                if(x>=0)
                {
                weight=weight+x;
                }
                else{alert("喝西北风");}
                if(weight<80){alert("瘦到不正常");}
                if(weight>=80&&weight<100){alert("偏瘦")}
                if(weight>=100&&weight<145){alert("正常");}
                if(weight>=145){alert("太胖了");}
                return 0;   
            },
            run:function(distance){
                if(distance<1000){alert("有点吃力");}
                if(distance>=1000&&distance<2000){alert("折磨");}
                if(distance>2000){alert("原地去世");}
                return 0;
            }
        }
        person.eat(fan);
        person.run(howfar);
    </script>
</body>
</html>