"javascript check empty string or undefined"

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1. javascript check string null or undefined ••• /mo •••
2. javascript test string empty or undefined ••• /mo •••
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8. javascript check if string is empty or whitespace or undefined ••• /mo •••
9. javascript check if string is not empty or undefined or whitespace ••• /mo •••
10. javascript check string empty null undefined ••• /mo •••
11. javascript string empty or null or undefined ••• /mo •••
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13. javascript check if string is undefined ••• /mo •••
14. jquery check undefined or null or empty ••• /mo •••
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16. undefined check in javascript ••• /mo •••
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