JavaScript Basics: Difference between revisions
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The following are considered false: <code>false</code>, <code>0</code>, <code>""</code>, <code>null</code>, <code>undefined</code>, <code>NaN</code>. | The following are considered false: <code>false</code>, <code>0</code>, <code>""</code>, <code>null</code>, <code>undefined</code>, <code>NaN</code>. | ||
== Strings == | |||
<pre> | |||
" Hello ".trim() // "Hello" | |||
</pre> | |||
== Objects == | |||
<pre> | |||
for (var key in my_object){ | |||
// do something with key | |||
// value is my_object[key] | |||
} | |||
</pre> | |||
Revision as of 16:44, 18 April 2015
Link to external Javscript file
<head>
<title>Test</title>
<meta http-equiv="content-type" content="text/html;charset=utf-8" />
<script src="spectra.js" type="text/javascript" ></script>
</head>
Types
The built-in types are string, number, boolean, null, undefined, object.
Use typeof some_var to get the type.
The following are considered false: false, 0, "", null, undefined, NaN.
Strings
" Hello ".trim() // "Hello"
Objects
for (var key in my_object){
// do something with key
// value is my_object[key]
}