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  • 测开之路九十八:js变量和语句

    这里为了方便调试,在jsbin网站上面编写js脚本:https://jsbin.com/?js,console

    可以点击增加/减少对应展示分页,Console为控制台部分,Output为页面部分

    变量和运算

    if语句

    switch case

    while

    do while

    for循环

    for in

    var a = 10;
    var b = 20.5;
    console.log(typeof a);
    console.log(a+b);
    console.log(a>b);
    console.log(a<b && a>2);

    if(typeof a == "number"){
      document.write("条件成立");
      console.log("条件成立");
    }else{
      console.log("条件不成立");
    }

    //switch case
    var grade = 'X'
    switch(grade)
    {
      case "A": document.write("成绩为A");
      break;

      case "B": document.write("成绩为B");
      break;

      case "C": document.write("成绩为C");
      break;

      default: document.write("未知成绩");

    }

    //while
    var count = 0;
    while (count < 10){
      document.write("当前值是:" + count + "<br />");
      count++;
    }
    document.write("循环结束")


    //do while
    var count = 0;
    do{
      document.write("当前值是:" + count + "<br />");
      count++;
    }
    while(count < 10)

    //for
    for(var i=1; i<10; i++){
      document.write("当前值是:" + i + "<br />");

      //嵌套
      if(i == 8){
        break;
      }
    }
    document.write("循环结束");

    //for in
    var values = ["a", "b", "c", "d"];
    for (value in values){
      //遍历索引
      document.write("当前索引是:" + value + "<br />");

      //遍历值
      document.write("当前值是:" + values[value] + "<br />");
    }
    document.write("循环结束");

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  • 原文地址:https://www.cnblogs.com/zhongyehai/p/11408560.html
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