常数；会让文字栏位内的文字靠左对齐。

LEFT — Constant static property in class flash. text. TextFormatAlign.

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使用者可以选取对应的选项按钮，决定要靠左对齐、靠右对齐或置中对齐的格式。

The user could select a left-aligned, right-aligned, or centered format by selecting the corresponding radio button.

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传回新字串，此字串会以空格填补右侧至指定的总长度，靠左对齐这个字串中的字元。

Returns a new string that left-aligns the characters in this string by padding them with Spaces on the right, for a specified total length.

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