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<!-- dim a, b, c, d1sub ja = 1 * document.jsq.jg.valuedocument.jsq.jg.value=""d1=1end subsub jia = 1 * document.jsq.jg.valuedocument.jsq.jg.value=""d1 = 2end subsub chea = 1 * document.jsq.jg.valuedocument.jsq.jg.value=""d1 = 3end subsub cha = 1 * document.jsq.jg.valuedocument.jsq.jg.value=""d1=4end subsub db = 1 * cdocument.jsq.jg.valueselect case d1case 1document.jsq.jg.value=a+bcase 2document.jsq.jg.value=a-bcase 3document.jsq.jg.value=a*bcase 4document.jsq.jg.value=a/bend selectend sub-->为什么计算不出结果呀？