1 if(condition){2     statement1;3 }4 else{5     statement2;6 }

1 do{2     statement3 }while(expression);

1 while(expression){2     statement3 }

1 for(initialization;expression;post-loop-expression){2     statement;3 }

1 for(property in expression){2     statement3 }

 1 var iArr=new Array(1,2,3,4,5); 2 var index=0; 3  4 //do-while 5 do{ 6     console.log(iArr[index]); 7 }while(++index<iArr.length); 8  9 //while10 index=0;11 while(index++<iArr.length){12     console.log(iArr[index-1]);13 }14 15 //for16 for(index=0;index<iArr.length;index++){17     console.log(iArr[index]);18 }19 20 //for-in21 for(x in iArr){22     console.log(iArr[x]);23 }

1 label:statement

1 start:var iCount=10;

 1 var iNum=0; 2 for(var i=1;i<10;i++){ 3     if(i%5==0){ 4         break; 5     } 6     iNum++; 7 } 8 console.log(iNum);//4 9 10 iNum=0;11 for(var i=1;i<10;i++){12     if(i%5==0){13         continue;14     }15     iNum++;16 }17 console.log(iNum);//818 19 iNum=0;20 outer://标签21 for(var i=0;i<10;i++){22     for(var j=0;j<10;j++){23         if(i==5&&j==5){24             break outer;25         }26         iNum++;27     }28 }29 console.log(iNum);//5530 31 iNum=0;32 outer://标签33 for(var i=0;i<10;i++){34     for(var j=0;j<10;j++){35         if(i==5&&j==5){36             continue outer;37         }38         iNum++;39     }40 }41 console.log(iNum);//95

1 with(expression){2     statement3 }

1 var sMessage="Hello World";2 with(sMessage){3     console.log(toUpperCase());//HELLO WORLD4 }

 1 switch(expression){ 2     case value1: 3         statement 4         break; 5     case value2: 6         statement 7         break; 8     ... 9     case valueN:10         statement11         break;12     default:13         statement14 }

 1 var sColor="green"; 2 switch(sColor){ 3     case "red": 4         console.log("#FF0000"); 5         break; 6     case "green": 7         console.log("#00FF00");//#00FF00 8         break; 9     default:10         console.log("#FFFFFF");11 }

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