var n1 = $(".n1");
        var n2 = $(".n2");
        var n3 = $(".n3");
        var n4 = $(".n4");
        $(".sr").css("display", "none");
        $(".n1").css("display", "block");

        function c22() {
            if (n1.display = "block") {
                $(".n1,.n3,.n4").css("display", "none");
                $(".n2").css("display", "block");
            } else if (n2.display = "block") {
                $(".n1,.n2,.n4").css("display", "none");
                $(".n3").css("display", "block");
            } else if (n3.display = "block") {
                $(".n1,.n2,.n3").css("display", "none");
                $(".n4").css("display", "block");
            }
        }

        var val = $(".sr")
        for (var i = 0; i <= val.length; i++) {
            val[0].value = "请输入存款";
            val[1].value = "请输入每月工资";
            val[2].value = "请输入利率";
            val[3].value = "请输入年限";
        }
        $(".sr").click(function () {
            this.value = "";
        });

        function cc1(a, b, c, d) {
            var e = a + b + c * d;
            if (e <= 700) {
                alert("存款为" + e + "，不足700元");
            } else if (e >= 700) {
                alert("存款为" + e + "，已超过700元");
            }
        }