When working with a fixed width design, be sure to at least center the wrapper div to maintain a sense of balance (margin: 0 auto; usually does the trick).
如果要使用固定宽度设计，务必保证主容器居中对齐，以保持平衡(一般利用margin：0auto；就可以了)。
It may not be obvious, but the second and third layouts produce identical behaviors: They both maintain a fixed margin between the view and its superview as the superview's width changes.
或许不是很明显，但是第二第三个布局产生一样的行为：即使父视图的尺寸发生改变，它们都让视图和父视图的边距保持不变。
If there is no width constraint the view will stretch if you have a left and right margin.
如果没有宽度约束，如果您有左右边距，视图将伸展。
Returns the width of the element, in pixels. This width does not take into account any margin, border, scroll bar, or padding that might have been applied to the element.
返回，用像素，来表示的元素宽度，这个宽度不包括边框和状态条那些东东。
The approximate formula is: the initial bounding rectangle is inflated by pen width, and this result is multiplied by the miter limit, plus some additional margin to allow for end caps.
大概的公式为：初始周框会根据画笔宽度膨胀，而这个结果是乘以斜接限制，加上某些要考虑端点的额外边界。
The approximate formula is: the initial bounding rectangle is inflated by pen width, and this result is multiplied by the miter limit, plus some additional margin to allow for end caps.
大概的公式为：初始周框会根据画笔宽度膨胀，而这个结果是乘以斜接限制，加上某些要考虑端点的额外边界。
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