06.流程控制

if判断

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      var age=3;
      if(age>3){
          alert("haha");
      }else if(age<5){
          alert("hhhhhh");
      }else{
          alert("aaaaa");
      }

while循环

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      while (age<100){
          age-=1;
          console.log(age);
      }

      do{
          age+=1;
          console.log(age);
      }while (age<100);

      for(let i=0;i<100;i++){
          console.log(i);
      }

for循环

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      for(let i=0;i<100;i++){
          console.log(i);
      }

forEach循环

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      var age=[1,2,5,1,2,1,24,1,2,12,12,2,2];
      age.forEach(function (value){
          console.log(value);
      });

for..in

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      for(var num in age){
          if(age.hasOwnProperty(num)){
              console.log("y");
              console.log(age[num]);
          }
      }

iterator

map

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      let map=new Map(
          [
              ["cindy",100],
              ["lucy",90],
              ["tom",80]
          ]
      );
      for(var x of map){
          console.log(x);
      }

set

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    let set=new Set([1,2,3,4,2,2,1,1,2]);
    for(var x of set){
        console.log(x);
    }