3707人加入学习
(6人评价)
Web前端第三季(JavaScript)

制作完成于2018年6月14日

价格 免费
<!DOCTYPE html>
<head>
    <meta charset="UTF-8">
    <title>流程控制-if语句</title>
    <script type="text/javascript">
        // hp = 0;

        // //流程控制语句if
        // if(hp<=0){
        //     console.log("GameOver!")
        // }
        // console.log("继续");

        // if(布尔值){
        //     语句块;
        // }

        // if(true){
        //     console.log(true);
        // }
        // if(false){
        //     console.log(false);
        // }

        // var a = true; //对 是 有 1
        // var b = false;//错 不是 没有 0

        // ==  ===  !=  >  <  >=  <=
        // var n1 = 100,n2 = 90;
        // var res1 = n1==n2; //false
        // var res2 = n1!=n2; //true
        // var res3 = n1>n2; //true
        // var res4 = n1<n2; //false
        // var res5 = n1>=n2; //true
        // var res6 = n1<=n2; //false
        // console.log(res1);
        // console.log(res2);
        // console.log(res3);
        // console.log(res4);
        // console.log(res5);
        // console.log(res6);
        
        // console.log(n1==n2); //false
        // console.log(n1===n2); //false

        // console.log(100=="100"); //true
        // console.log(100==="100"); //首先判断类型是否一致,再判断值是否一致。

        // var hp = 50;

        // if(hp<=0){
        //     console.log("GameOver!");
        // }else{
        //     console.log("继续玩游戏");
        // }

        // var season = 1;
        // if(season==1){
        //     console.log("春季");
        // }else if(season==2){
        //     console.log("夏季");
        // }else if(season==3){
        //     console.log("秋季");
        // }else{
        //     console.log("冬季");
        // }
        //if...else if...else 只会执行其中一种if

        var month = 2; // 1 - 12
        // 2-5
        // if(month>=2){
        //     if(month<=5){
        //         console.log("当前是春季");
        //     }
        // }

        // && || 
        // var a = 10,b=20;
        // var res1 = true && true;
        // console.log(res1);

        // var res1 = true || false; //var res1 = a>=25 || b>=25;
        // console.log(res1);

        if(month>=2 && month<=5){
            console.log("春季");
        }

    </script>
</head>
<body>
    
</body>
</html>

逻辑运算符
&&   和(and)    表示同时满足两个条件
||    或者(or)    表示满足其中一个条件

[展开全文]

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