javascript - How can I determine if a variable is 'undefined' or 'null'?

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Javascript, how can I determine if a variable is undefined or null? Javascript, how can I determine if a variable is undefined or null?
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Is there a standard function to check for null, undefined, or blank variables in JavaScript Is there a standard function to check for null, undefined, or blank variables in JavaScript
How can I determine if a variable is How can I determine if a variable is 'undefined' or 'null'?
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Is there a standard function to check for null, undefined, or blank variables in JavaScript? Is there a standard function to check for null, undefined, or blank variables in JavaScript?