JS (conditional statement, loop statement)

Conditional statement IF

Syntax:if (condition) statements1 else Statement2

Chestnuts:

<Scripttype= "Text/javascript">    varI=Prompt ("Please enter your score."); if(i>=  the &&I<= -) {alert ("Good grades"); }Else if(i>=  - &&I<  the) {alert ("Score Qualified"); }Else if(i<  - &&I>=0) {alert ("failure to pass the grade"); }</Script>

Conditional Statement Switch

Grammar:

switch (expression) {case        value:            //statement break            ;        Case value:            //statement break            ;        Default:            //statement    }

Chestnuts:

<Scripttype= "Text/javascript">    varI=  -; Switch(i) { Case  -: Alert (i+ "equals");  Break;  Case  -: Alert ( -);  Break; default: Alert (" Other"); }</Script>

While loop

Syntax: while (exp) {//statements;}

Description: while (variable <= end value) {code to be executed}

Chestnuts:

<Scripttype= "Text/javascript">    varI= 1;  while(i< 3) {alert (i); I++; }</Script>

Do...while Cycle

Syntax: do {//statements;} while (condition);

Description: Do {code to be executed} while (variable <= end value)

Chestnuts:

<Scripttype= "Text/javascript">    varI= 1;  Do{alert (i); I++; } while(i< 3);</Script>

For loop

Syntax: for (initial; expression; post-loop-expression) {//statement;}

Description: for (variable = start value; variable <= end value; variable = variable + step value) {Code to execute}

Chestnuts:

<Scripttype= "Text/javascript">     for(varI= 1; I< 3; I++) {alert (i); }</Script>

Break statements and Continue statements

Description: The break statement can exit the loop immediately; The continue statement simply exits the current loop;

Chestnuts:

<Scripttype= "Text/javascript">    varN= 0;  for(varI= 1; I< Ten; I++){        if(i== 4){            Continue; } N++;        } alert (n); varm= 0;  for(varJ= 1; J< Ten; J++){        if(J> 5){             Break; } m++; } alert (m);</Script>

JS (conditional statement, loop statement)