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Code for a simple JavaScript countdown timer?

I want to use a simple countdown timer starting at 30 seconds from when the function is run and ending at 0. No milliseconds. How can it be coded? ...
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Is there an equivalent for var_dump (PHP) in Javascript?

... 220 As the others said, you can use Firebug, and that will sort you out no worries on Firefox. Chrom...
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Why doesn't indexOf work on an array IE8?

...exOf = function(elt /*, from*/) { var len = this.length >>> 0; var from = Number(arguments[1]) || 0; from = (from < 0) ? Math.ceil(from) : Math.floor(from); if (from < 0) from += len; for (; from < len; from++) { if (from in...
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How can I transition height: 0; to height: auto; using CSS?

...y Chris Jordan in another answer here. #menu #list { max-height: 0; transition: max-height 0.15s ease-out; overflow: hidden; background: #d5d5d5; } #menu:hover #list { max-height: 500px; transition: max-height 0.25s ease-in; } <div id="menu"> <a...
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What are the options for storing hierarchical data in a relational database? [closed]

...ttle for one or the other especially if there are more than, say, a lousy 100,000 nodes or so. Using the push stack method can take a whole day to do the conversion on what MLM'ers would consider to be a small million node hierarchy. I thought I'd give Celko a bit of competition by coming up with ...
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Change column type from string to float in Pandas

... +200 You have four main options for converting types in pandas: to_numeric() - provides functionality to safely convert non-numeric types...
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UIImage: Resize, then Crop

...h; CGFloat targetHeight = targetSize.height; CGFloat scaleFactor = 0.0; CGFloat scaledWidth = targetWidth; CGFloat scaledHeight = targetHeight; CGPoint thumbnailPoint = CGPointMake(0.0,0.0); if (CGSizeEqualToSize(imageSize, targetSize) == NO) { CGFloat widthFact...
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python plot normal distribution

...ot as plt import numpy as np import scipy.stats as stats import math mu = 0 variance = 1 sigma = math.sqrt(variance) x = np.linspace(mu - 3*sigma, mu + 3*sigma, 100) plt.plot(x, stats.norm.pdf(x, mu, sigma)) plt.show() s...
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How to remove Firefox's dotted outline on BUTTONS as well as links?

... 803 button::-moz-focus-inner { border: 0; } ...
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ViewPager.setOffscreenPageLimit(0) doesn't work as expected

...ning about this in LogCat, something like: Requested offscreen page limit 0 too small; defaulting to 1 share | improve this answer | follow | ...