JavaScript练习（一）

var name="张三";
        var age="21";
        var sex="男";
        var job="学生";
        var address="江苏南京";
        var phone="1234567";
        document.write("姓名："+name+"<br>");
        document.write("年龄："+age+"<br>");
        document.write("性别："+sex+"<br>");
        document.write("职业："+job+"<br>");
        document.write("住址："+address+"<br>");
        document.write("电话："+phone+"<br>");

 var name =prompt("请输入您的姓名:");
       var HTML=prompt("请输入您的HTML成绩:");
       var CSS=prompt("请输入您的CSS成绩:");
       var JavaScript=prompt("请输入您的JavaScript成绩:");
       var name2 =prompt("请输入您的姓名:");
       var HTML2=prompt("请输入您的HTML成绩:");
       var CSS2=prompt("请输入您的CSS成绩:");
       var JavaScript2=prompt("请输入您的JavaScript成绩:");
       console.log("姓名\t\tHTML\t\tCSS\t\tJavaScript");
       console.log(name+"\t\t"+HTML+"\t\t\t"+CSS+"\t\t"+JavaScript);
       console.log(name2+"\t\t"+HTML2+"\t\t\t"+CSS2+"\t\t"+JavaScript2);

var num1=3;
      var num2=8;
      console.log("交换前的值：","num1:"+num1,"num2:"+num2);
      //方法1：使用临时变量进行交换 
      var temp=num1;//3
          num1=num2;//8
          num2=temp;//3
      console.log("交换后的值：","num1:"+num1,"num2:"+num2);
      //方法2：使用加减运算
      var num1=3;
      var num2=8;
      num1=num1+num2;//11
      num2=num1-num2;//3
      num1=num1-num2;//8
      console.log("交换后的值：","num1:"+num1,"num2:"+num2);
      //方法3：数组的解构赋值
      var num1=3;
      var num2=8;
      [num1,num2]=[num2,num1];
      console.log("交换后的值：","num1:"+num1,"num2:"+num2);

var name=prompt("请输入姓名:");
      var grade=prompt("请输入成绩:");
      var grade2=Number(grade)+5;
      console.log("姓名："+name+"\t\t成绩:"+grade);
      console.log("老王的成绩:"+grade2);