The preceding line of code declares the variable speed and by using the assignment operator = assigns it a value of 63. We may now use this variable in other statements:
Variables need not be numeric; the statement
assigns a string to the variable lastname.
This code would write Hello, Susan Smith into our document.
You met the concept of an object earlier in the lesson and saw how objects have both properties that describe them and methods that perform actions on them.
This string starts with the object document, then refers to an objectimage1 within that object, and finally the property src (the source file for the image).Suppose that we have the following HTML code somewhere in our page:
The first action of the function is to assign the user’s entered value to the variable numentered. We then test that number for validity by checking that it is greater than or equal to 1 and less than or equal to 10. Depending on the result, we either return a value of true to the calling form (thus allowing the form to be submitted) or pop up a dialog informing of the error. In the latter case, when the user clicks OK to clear the dialog, a value of false is returned to the calling form, preventing the form from being submitted until the user enters appropriate data.
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