The Global object has properties and methods at the highest level, without a parent object. This means that global properties and functions can be used with all the built-in JavaScript objects.


• The Global object has three properties:
Global object methods (or functions):
- In the following example is a JS script that uses the method eval() twice, transform and interpret the argument received as a JavaScript code.
<script type="text/javascript"><!--
function calcs(form) {
  form.re.value = eval(form.expr.value);
}
eval("alert('Have a good life!')");
--></script>
<form>
 <p>Enter a mathematical expression (addition, subtraction, multiplication, division), for example (7*8 or 3+8/2): </p>
 <input type="text" name="expr" size="35" />
 <input type="button" name="calc" value="Calculation" onclick="calcs(this.form)" /><br />
 The result is:
 <input type="text" name="re" size="18">
</form>
- This code displays an alert window and then the following result. A form that you can use for simple math operations:

Enter a mathematical expression (addition, subtraction, multiplication, division), for example (7*8 or 3+8/2):


The result is:

Daily Test with Code Example

HTML
CSS
JavaScript
PHP-MySQL
Which attribute is used in <a> tag for the address of the link?
src href rel
<a href="http://coursesweb.net/" title="CoursesWeb.net">CoursesWeb.net</a>
Which CSS property sets the type of the text font?
font-family text-decoration font-size
h2 {
  font-family:"Calibri",sans-serif;
}
What instruction selects all the <div> tags with class="cls"?
querySelector("div.cls") getElementsByTagName("div") querySelectorAll("div.cls")
var elm_list = document.querySelectorAll("div.cls");
var nr_elms = elm_list.length;       // number of selected items
alert(nr_elms);
Indicate the function that can be used to get the sum of values in an array.
array_sum() array_diff() array_shift()
$arr = array(1, 2, 3, 4);
$arr_sum = array_sum($arr);
echo $arr_sum;       // 10
Global Object

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