From 37e4e0d4a0ef31fc5dfa0f08068d0de8d307214e Mon Sep 17 00:00:00 2001
From: callmeyan <yaclty2@gmail.com>
Date: Sun, 31 Dec 2023 21:40:28 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A0=E6=B2=99=E7=AE=B1?=
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---
 src/components/product/index.vue | 70 ++++++++++++++++++++++++++++++--
 1 file changed, 66 insertions(+), 4 deletions(-)

diff --git a/src/components/product/index.vue b/src/components/product/index.vue
index 461855f..4581a47 100644
--- a/src/components/product/index.vue
+++ b/src/components/product/index.vue
@@ -1,11 +1,73 @@
 <script setup lang="ts">
+import { Button, Input, Space, Message } from "view-ui-plus";
+import { ref } from "vue";
 
+const values = ref({ a: 1, b: 22, c: 3 })
+const expression = ref('a+b')
+const result = ref('')//, message = ref('')
+
+// 沙箱
+function sandbox(code: string) {
+    code = 'with (sandbox) {return ' + code + '}'
+    const fn = new Function('sandbox', code)
+    // const unscopables = { testB: true };
+    return function (sandbox: any) {
+        const sandboxProxy = new Proxy(sandbox, {
+            has: (target: Object, prop: string) => {
+                // console.log('has->', target, prop)
+                return target.hasOwnProperty(prop) || prop in target;
+            },
+            get(target, key) {
+                // console.log('get->', target, key)
+                if (key === Symbol.unscopables) return null;
+                return target[key]
+            }
+        })
+        return fn(sandboxProxy)
+    }
+}
+
+const onCalculate = () => {
+    if (expression.value.length === 0) {
+        Message.warning("请输入表达式")
+        return;
+    }
+    // 从expression获取计算表达式并读取values中的参数计算最终数据
+    // 然后将结果赋值给result
+    // 注意：values中的参数名要与expression中的参数名一致
+    // 例如：values中的参数名为a,b,c，则expression中的参数名也要为a,b,c
+
+    try {
+        const func = sandbox(expression.value)
+        Object.keys(values.value).forEach(key => {
+            // 转换成数字
+            //@ts-ignore
+            values.value[key] = Number(values.value[key])
+        })
+        const value = func(values.value);
+        result.value = value; //eval(expression.value)
+    } catch (e) {
+        result.value = "计算错误:" + (e as Error).message
+    }
+}
 </script>
 
 <template>
-    <h1>product</h1>
+    <div>
+        <h1>动态计算</h1>
+        <Space direction="vertical" style="width: 100%">
+            <Space>
+                <Input type="number" v-model="values.a" />
+                <Input type="number" v-model="values.b" />
+                <Input type="number" v-model="values.c" />
+            </Space>
+            <div class="calculator">
+                <Input v-model="expression" type="textarea" :rows="4" placeholder="请输入计算公式" />
+            </div>
+            <Button @click="onCalculate">计算</Button>
+            <div v-if="expression.length > 0 && result">结果:{{ expression }} = {{ result }}</div>
+        </Space>
+    </div>
 </template>
 
-<style scoped lang="scss">
-
-</style>
+<style scoped lang="scss"></style>