定位：英文是简写，用来把文字或数字依照栏位对齐。
TAB: Short for TABulation, used to align columns of text or figures.
定位： 英文是简写， 用来把文字或数字依照栏位对齐。
Tab: Short for tabulation , used to align columns of text or figures.
占位符就是出现在输入框的提示文本，当你点击输入栏位，它就自动消失。
A place holder is when text appears in the input field and when you click on the input field it disappears.
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