diff --git "a/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/demo01.js" "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/demo01.js"
new file mode 100644
index 0000000000000000000000000000000000000000..395603c443b7ba2655bb0a033e29ab0fe406a7f5
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/demo01.js"	
@@ -0,0 +1,28 @@
+var calculator = {
+
+    add:function(x,y){
+        return x + y;
+    },
+    subtract:function(x,y) {
+        return x - y;
+    },
+    multiply:function(x,y) {
+        return x * y;
+    },
+    divide:function(x,y) {
+        return x / y;
+    }
+}
+
+function handle(x,y,symbol){
+    if(isNaN(x) || isNaN(y)){
+        throw Error('请输入正确数值');
+    }if (x===0 || y===0 && symbol==='divide') {
+        throw Error('0不能作为除数或被除数');
+    }
+    return calculator[symbol](x,y);
+}
+
+
+
+module.exports.handle = handle;
diff --git "a/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/demo02.js" "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/demo02.js"
new file mode 100644
index 0000000000000000000000000000000000000000..3896058cf93fdcd736ca98516e3fa67727e7483a
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/demo02.js"	
@@ -0,0 +1,13 @@
+let size = require('./demo01');
+
+
+/*console.log(size.handle('x','y','add'));
+console.log(size.handle(5,5,'add'));
+console.log(size.handle('x','y','add'));
+*/
+try{
+    let count = size.handle(5,0,'multiply');
+    console.log(count);
+}catch(error){
+    console.log(error.message);
+}
\ No newline at end of file
diff --git "a/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/package.json" "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/package.json"
new file mode 100644
index 0000000000000000000000000000000000000000..01167f5b8866cf7fbf1b9d64bcbb9c63b365a933
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/size/package.json"	
@@ -0,0 +1,11 @@
+{
+  "name": "size",
+  "version": "1.0.0",
+  "description": "",
+  "main": "demo01.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}
diff --git "a/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/\345\212\240\345\207\217\344\271\230\351\231\244/demo01.js" "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/\345\212\240\345\207\217\344\271\230\351\231\244/demo01.js"
new file mode 100644
index 0000000000000000000000000000000000000000..9346c1281bfaaff1941ceeac43acdc022a4107e6
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/\345\212\240\345\207\217\344\271\230\351\231\244/demo01.js"	
@@ -0,0 +1,49 @@
+module.exports = class comput {
+    constructor(a,b) {
+        this.a = a;
+        this.b = b;
+    }
+
+    //加
+    addition() {
+        return this.a + this.b;
+    }
+
+    //减
+    subtraction() {
+        return this.a - this.b;
+    }
+
+    //乘
+    multiplication() {
+        return this.a * this.b;
+    }
+
+    //除
+    division() {
+        return this.a / this.b;
+    }
+
+}
+
+
+
+// //加
+// module.exports = function (x,y) {
+//     return parseInt(x) + parseInt(y);
+// }
+
+// //减
+// module.exports = function (x,y) {
+//     return parseInt(x) - parseInt(y);
+// }
+
+// //乘
+// module.exports = function (x,y) {
+//     return parseInt(x) * parseInt(y);
+// }
+
+// //除
+// module.exports = function (x,y) {
+//     return parseInt(x) / parseInt(y);
+// }
\ No newline at end of file
diff --git "a/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/\345\212\240\345\207\217\344\271\230\351\231\244/demo02.js" "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/\345\212\240\345\207\217\344\271\230\351\231\244/demo02.js"
new file mode 100644
index 0000000000000000000000000000000000000000..6ff02021af8278221f0f5e41bbfafc4b56a6e706
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0222 \345\233\233\345\210\231\350\277\220\347\256\227/\345\212\240\345\207\217\344\271\230\351\231\244/demo02.js"	
@@ -0,0 +1,10 @@
+// module.exports = {
+
+// }
+const Calculate = require('./demo01');
+let cal = new Calculate(5.1,5);
+
+console.log(cal.addition());
+console.log(cal.subtraction());
+console.log(cal.multiplication());
+console.log(cal.division());
diff --git "a/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/DEMO1.js" "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/DEMO1.js"
new file mode 100644
index 0000000000000000000000000000000000000000..7996d2e2a733d3f35b02ab11d918fb7a8e231a09
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/DEMO1.js"	
@@ -0,0 +1,19 @@
+//加
+module.exports.add = function (x,y) {
+    return parseInt(x) + parseInt(y);
+}
+
+//减
+module.exports.subtract = function (x,y) {
+    return parseInt(x) - parseInt(y);
+}
+
+//乘
+module.exports.multiply = function (x,y) {
+    return parseInt(x) * parseInt(y);
+}
+
+//除
+module.exports.divide = function (x,y) {
+    return parseInt(x) / parseInt(y);
+}
\ No newline at end of file
diff --git "a/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/DEMO2.js" "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/DEMO2.js"
new file mode 100644
index 0000000000000000000000000000000000000000..bb815c30e5f808fcce19137e211c3190dfa34374
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/DEMO2.js"	
@@ -0,0 +1,8 @@
+let count = require('./DEMO1');
+
+try{
+    let num = count.add(5,0);
+    console.log(num);
+}catch(error){
+    console.log(error.message);
+}
\ No newline at end of file
diff --git "a/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/demo01.js" "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/demo01.js"
new file mode 100644
index 0000000000000000000000000000000000000000..11a03868496a88d768afca33b0c9e635be5c1fb1
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/demo01.js"	
@@ -0,0 +1,35 @@
+var calculator = {
+
+    '+':function(x,y){
+        return x + y;
+    },
+    '-':function(x,y) {
+        return x - y;
+    },
+    '*':function(x,y) {
+        return x * y;
+    },
+    '/':function(x,y) {
+        return x / y;
+    }
+}
+
+function handle(x,y,symbol){
+    if(isNaN(x) || isNaN(y)){
+        throw Error('请输入正确数值');
+    }if (x===0 || y===0 && symbol==='/') {
+        throw Error('0不能作为除数或被除数');
+    }
+    return calculator[symbol](x,y);
+}
+
+
+
+module.exports.handle = handle;
+
+//module.exports.add = add;
+//module.exports.subtract = subtract;
+//module.exports.multiply = multiply;
+//module.exports.divide = divide;
+
+
diff --git "a/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/demo02.js" "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/demo02.js"
new file mode 100644
index 0000000000000000000000000000000000000000..c59cdee55622ce8fb86087e4966ad15ee54756d6
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/demo02.js"	
@@ -0,0 +1,13 @@
+let size = require('./demo01');
+
+
+/*console.log(size.handle('x','y','add'));
+console.log(size.handle(5,5,'add'));
+console.log(size.handle('x','y','add'));
+*/
+try{
+    let count = size.handle(5,0,'+');
+    console.log(count);
+}catch(error){
+    console.log(error.message);
+}
\ No newline at end of file
diff --git "a/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/package.json" "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/package.json"
new file mode 100644
index 0000000000000000000000000000000000000000..01167f5b8866cf7fbf1b9d64bcbb9c63b365a933
--- /dev/null
+++ "b/\345\276\220\345\275\254\345\275\254/0223 \345\233\233\345\210\231\344\274\230\345\214\226/size/package.json"	
@@ -0,0 +1,11 @@
+{
+  "name": "size",
+  "version": "1.0.0",
+  "description": "",
+  "main": "demo01.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "ISC"
+}