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由于JavaScript中的浮点数计算本身就不准确，所以项目案例也存在浮点数计算不准确的问题
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组件的data-val属性值可以通过事件对象获取。
WXSS具有CSS大部分特性，并在此基础上做了一些扩充和修改。
WXSS支持使用选择器来为某个元素设置样式，其使用方法和CSS选择器基本相同。
B. Summary of TextSummaryOn the tour of France, the sight of the Mediterranean Sea reminded me of last summer when I, as a good swimmer, had hopped from the highest diving board at a pool and, as a result, hit the water with an impact so incredible that I ____( ). From then on,my fear of water refused to ____( ). In the ____( ) of my painful memory, however, I heard shouting in French and saw a mob of people running into the sea with their clothes on. I realized the ____( )with horror - rough waves were forcibly dragging a boy out to the sea. But despite the rescuers’ great effort, they made little progress in reaching the drowning boy. ____( ) the situation, I found it was the quickest access to the boy to go out on the jetty. I raced down the beach but when hit with water at the ridge of the jetty, I whirled around, convinced that someone else would save the boy. To my ____( ), no one was there.Seen from there, the boy was being ____( ) by vicious waves. Without any more delay, I threw myself into the water. I reached the boy in time to have him ____( ). After overcoming the ____( ) through swimming sideways first and then floating to rest, we slowly made our way to safety. And the moment my hand hit the jetty, nothing signified my ____( ) as much as just letting myself go in the water.
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