變更 Firefox for Android 預設下載路徑

1. about:config
2. browser.download.folderList，原本值為1，變更為2
3. 新增字串，browser.download.dir，並填入自訂路徑

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How to change download path or location in android fire fox | Firefox for Android 技術支援討論區 | Mozilla 技術支援

Array method (max,min,sum,avg)

	Array.prototype.max = function() {
	return Math.max.apply(null, this);
	};
	Array.prototype.min = function() {
	return Math.min.apply(null, this);
	};
	Array.prototype.sum = Array.prototype.sum || function() {
	return this.reduce(function(sum, a) {
	return sum + Number(a)
	}, 0);
	};
	Array.prototype.avg = Array.prototype.avg || function() {
	return this.sum() / (this.length || 1);
	};

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javascript - Array Sum and Average - Stack Overflow
JavaScript: min & max Array values? - Stack Overflow

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