Getting Started with Javascript by Lentzner Remy;

Author:Lentzner, Remy;
Language: fra
Format: epub
Publisher: Editions Remylent
Published: 2021-02-04T13:51:46+00:00

Figure 2.3 : A for loop in action

The code line below changes a p pointer from 0 to 5. The third parameter increments p by 1.

for(let p=0;p<=5;p++)

The code line below adds the word hello followed by the p pointer value to the element already present in the body. The expression <br> indicates to go to the line.

The += operator means the result is added to what was there before.

For example, D+=6 is equivalent to D=D+6.

document.getElementById("p1").innerHTML+="hello "+p+"<br>";

Example 2 : The following code changes in red the color of all labels. We start by retrieving all the names of the objects, then we read each label in a table setting the new color.

<script>

function test()

{

// I retrieve in a variable all of the label objects

var elements = document.querySelectorAll("label");

// I loop through this set

for (var i = 0; i < elements.length; i++)

{

// I change the color

elements[i].style.color="red";

}}

</script>

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