VirtualMV/JavaScript/Starting/Controlling flow
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< VirtualMV | JavaScript
Introduction
Overview
A programmer is asked by their partner to "go to the dairy and get a loaf of bread. If they have eggs, get a dozen." The programmer come home with 12 loaves of bread.
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By the end of this page you will be able to: |
Controlling the flow - making decisions
Javascript decision functions are very similar to those used in C++
The three comonly used decision functions are:
- if {…..}
- if {……} else {…..}
- switch
if
if (condition){ code to be executed if condition is true }
if .... else
if (condition){ code to be executed if condition is true } else { code to be executed if condition is false }
Example (js1_09)
<html> <body> <script type="text/javascript"> var datDate = new Date(); var vntTime = datDate.getHours(); if (vntTime < 12) { document.write("Time =" + vntTime + " <b>Good morning</b>") } else { document.write("Time =" + vntTime + " <b>Good afternoon</b>")}; </script> <p>This example demonstrates the If statement.</p> <p>If the time on your browser is less than 12, you will get a "Good morning" greeting.</p> <p> otherwise you will get a good afternoon</p> </body> </html>
Example :Click here to run js1_09.
switch
switch(n){ case 1: execute code block 1 break; // prevents code running into the next case case 2: execute code block 2 break; default: code to be executed if n is different from case 1 and 2 }
Example (js1_10)
<script type="text/javascript"> /* You will receive a different greeting based on what day it is. Note that Sunday=0, Monday=1, Tuesday=2, etc.*/ var datDate=new Date(); datDay=datDate.getDay(); switch (datDay){ case 1: document.write("Drat it’s Monday"); break; case 2: document.write("Only Tuesday"); break; // remainder of the code default: document.write("I'm looking forward to this \ weekend!")}; </script>
Example :Click here to run js1_10.
References
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virtualMV | Superquick wiki guide | Please give me some feedback |
VirtualMV/JavaScript/Starting/Controlling flow. (2024). In WikiEducator/VirtualMV wiki. Retrieved December 21, 2024, from http:https://wikieducator.org/VirtualMV/JavaScript/Starting/Controlling_flow (zotero)
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