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14 Cards in this Set
- Front
- Back
How do you prevent browsers which don't support javascript from displaying javascript as page content
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Add an html comment tag, <!--, before the first javascript statement and a comment closing tag, --> after the last javascript statement
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Where do you put the javascript in a page if you do not want the script to be executed immediately
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Put the javascript inside of a function which should be placed in the head of the page to keep it separate from page content
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How do you refer an html document to an external javascript file
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Point to the .js file in teh "src" attribute of the <script> tag. <script type="text.javascript" srcr="xxx.js"></script>
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Javascript statement tells browser to write something
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document.write("Hello!");
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What is a javascript block
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A block makes the sequence of javascript statements executed together and starts with a left curly bracket, {, and ends with a right curly bracket, }
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How do your write comments on one line
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Use //
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How do you write multi line comments
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Use /* before and */ after sooo
/* This is an awesome comment */ |
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What are the rules for naming javascript variables
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they are case sensitive and must begin with a letter or underscore character
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How do you declare variables in javascript
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with the var statement
examples: var x; var carname; |
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How do you assign values to variables?
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var x=5;
var carname="Volvo"; Text values require quotes while numbers do not |
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List the js arithmetic operators
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+ addition, - subtraction, * multiplication, / division, % modulus, ++ increment, -- decrement
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List the js assignment operators
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=, +=, -=, *=, /=, %=
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List the js comparison operators
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== is equal to, === is exactly equal to (value and type), != is not equal, > greather, < less, >= greater than or equal to, <= less than or equal to
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List the js logical operators
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&& and, || Or, ! not
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