Nineth Lesson JavaScript Statement Application Example

If...else statements

1 var a=12; 2 if (a>10) {3    alert ("A has a value greater than ten"); 4 }else{5    alert ("A value is not less than ten"); 6 }

If...else...if statements

1 var a=12; 2 if (a<) {3    alert ("A's value is less than ten"); 4 }else if (a==10) {5     alert ("A's value equals ten"); 6 }else{7    alert ("A value greater than ten"); 8 }

If nested statements

1 var a=8; 2 if (a>=10) {  3    if (a==10) {  4        alert ("a=10"); 5     }else{  6        alert ("a>10"); 7     }  8}else{  9    alert ("A's value is not more than ten"); Ten }

Switch...case statements

1 var a=2;2 switch (a) {3 Case 1:4 alert ("hem");5 Case 2:6 alert ("2222");7 Case 3:8 alert ("hehe");9 Case 4:Ten alert ("hehe"); One Default: A alert ("What Are you laughing at"); -}

1 var a=parseint (Prompt ("Please enter the first number");2 var b=parseint (Prompt ("Please enter a second number"));3 var c=prompt ("Please enter Operator");4 switch (c) {5 Case "+":6 alert (a+b);7 Case "-":8 alert (A-B);9 Case "*":Ten alert (a*b); One Case "/": A alert (A/b); - Case "%": - alert (a%b); the Default: - alert ("string Error"); -}

Looping statements

1 for (var a=0;a<a=a+1) {2     if (a==5) {  3         continue; 4     }5    alert (a); 6 }

The output is removed from 0-9 except 5.

Instance Application

1 //write out the odd number within 100 2 var str= ""; 3 for (Var a=1;a<a++) {4    if (a%2! =0) {5         str=str+a+ ","; 6     }7}8alert (str);

1 //Beg 1+2+3+4+ ... 10 and 2var sum=0; 3 for (Var a=1;a<one; a++) {4    sum=sum+a; 5 }6alert (sum);

1 //ask for factorial of 1-10 2 var sum=1; 3 for (Var a=1;a<one; a++) {4    sum=sum*a; 5 }6alert (sum);

1 //Output multiplication table 2 for (var a=1;a<, a++) {3for    (var b=1;b<10;b+ +) {4         if (a<=b) {5             alert (A + "multiplied by" +b+ "equals" +a*b "); 6         }7    }8}

Can output 81 times multiplication formula

1 number of//100 within 7 related to 2 var str= ""; 3 for (Var a=1;a<a++) {4    if (a%7==0) | | (a%10==7) | | ((a-a%10)/10==7)) {5         str=str+a+ ","; 6     }7}8alert (str);

1 //Basketball from 5 meters height, each bounce height is 30% of the original height, output the sixth time to bounce height 2 var gao=5; 3 for (A=1;a<7; a++) {4    Gao=gao*0.3; 5 }6alert (GAO);

1 //Suppose a sesame weight 0.000001kg, to be filled with 32 squares of the chessboard, the first 1 tablets, the second 2 tablets, the third Geffon 4 tablets, fourth Geffon 8 tablets, filled with the need for multiple sesame.  2var sum=1; 3 var a=1; 4 for (Var i=1;i<; i++) {5    a=a*2; 6     sum =sum+a; 7 }8alert (sum*0.000001);

Nineth Lesson JavaScript Statement Application Example