目录传统 instanceof 的问题示例：改进后的 instanceof示例：详细特性1. 自动类型绑定2. 与逻辑运算符结合3. 支持复杂类型4. 作用域限制总结与优势适用场景Java
I have a block element that is positioned absolutely and some other elements on page that are positioned fixed. The effect is the block on top floats over the page which wo开发者_开发问答rks well.
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