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==============================[br]eval 函數(shù)[br]功能：先解釋javascript代碼，然后在執(zhí)行它[br]用法：eval(codestring)[br]codestring是包含有javascript語句的字符串，在eval之后使用javascript引擎編譯。[br][br]注釋：[br][br]例子：eval(id + "_icon.src="/imgs/collapse_up.gif'");[br]id是之前設(shè)定的參數(shù)，而在雙引號(hào)中的字符串則是需要編譯的[br][br]引用:[br]--------------------------------------------------------------------------------[br]function tophide(id) //id indicates menu[br]{[br] if (top.topframeset.rows == "31,*")[br] {[br] top.topframeset.rows = "86,*";[br] eval(id + "_icon.src="/imgs/collapse_up.gif'");[br] eval(id + "_icon.alt='collapse the head'");[br] head.style.display = "block"[br] }[br] else[br] {[br] top.topframeset.rows = "31,*";[br] eval(id + "_icon.src="/imgs/collapse_down.gif'");[br] eval(id + "_icon.alt='expand the head'");[br] head.style.display = "none"[br] }[br]}