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def tried return falseendwhile tried do puts("a") end # a single-line while loopwhile tried # a multiline while loop puts("b")endputs("c") while tried # single-line while modifierbegin # multiline while modifier puts("d")end while tried def tried return trueenduntil tried do puts("a") end # a single-line while loopuntil tried # a multiline while loop puts("b")endputs("c") until tried # single-line while modifierbegin # multiline while modifier puts("d")end until tried 转载地址：http://cocum.baihongyu.com/