diff --git "a/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/.keep" "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_1.log" "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_1.log"
new file mode 100644
index 0000000000000000000000000000000000000000..248a78627bcdc21d2ff945eb8eb319502b29658e
--- /dev/null
+++ "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_1.log"
@@ -0,0 +1,57 @@
+// 声明一个可变变量
+var a = 1;
+let b = 2;
+a
+1
+b
+2
+
+const NAME = "chaos"
+NAME
+"chaos"
+
+let minNum = 20;
+let maxNum = 30;
+parseInt(Math.random()*maxNum);
+20
+parseInt(Math.random()*maxNum);
+29
+parseInt(Math.random()*maxNum);
+26
+parseInt(Math.random()*maxNum);
+3
+parseInt(Math.random()*maxNum);
+7
+parseInt(Math.random()*maxNum);
+11
+parseInt(Math.random()*maxNum);
+24
+parseInt(Math.random()*maxNum);
+4
+parseInt(Math.random()*maxNum);
+8
+parseInt(Math.random()*maxNum);
+2
+
+// 普通函数
+function randInt(minNum, maxNum){
+    return parseInt(Math.random()*(maxNum-minNum)) + minNum
+}
+randInt(10,20)
+17
+randInt(10,20)
+17
+randInt(10,20)
+11
+randInt(10,20)
+18
+randInt(10,20)
+11
+randInt(10,20)
+15
+
+// 匿名函数
+(function(minNum, maxNum){
+    console.log(parseInt(Math.random()*(maxNum-minNum)) + minNum)
+})(12,22)
+
diff --git "a/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_2.log" "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_2.log"
new file mode 100644
index 0000000000000000000000000000000000000000..dab1345627dfe3f3e2c0ac6b9745d6f69b42e23f
--- /dev/null
+++ "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_2.log"
@@ -0,0 +1,44 @@
+// 变量和函数用小驼峰命名法
+let myVariable = 1;
+myVariable
+1
+
+// 常量用大写
+const MAX_NUM = 1000;
+MAX_NUM
+1000
+
+// 类和构造函数使用大驼峰命名法
+function Dog(){
+    this.color = 'black';
+}
+dog = new Dog();
+
+typeof false
+"boolean"
+typeof Boolean
+"function"
+typeof 1
+"number"
+typeof 1.0
+"number"
+typeof 1n
+"bigint"
+typeof '1'
+"string"
+typeof Symbol(1)
+"symbol"
+let c = Symbol(2)
+typeof c;
+"symbol"
+
+let myArray = [1, 2]
+myArray[3] = 'a'
+"a"
+
+let myMap = new Map()
+myMap
+
+let mySet = new Set()
+mySet.add(1)
+
diff --git "a/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_3.log" "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_3.log"
new file mode 100644
index 0000000000000000000000000000000000000000..066a5ce7d09c8d443f4b9b9f30f2ec9528a96f3d
--- /dev/null
+++ "b/\347\254\254\344\272\214\346\234\237\350\256\255\347\273\203\350\220\245/2\347\217\255/2\347\217\255_chaos/\347\254\254\345\215\201\345\205\253\345\221\250/week18_3.log"
@@ -0,0 +1,96 @@
+a = "1" + 2
+"12"
+b = "2" + {}
+"2[object Object]"
+for(i=0; i<b.length; i++){
+    console.log(b[i])
+}
+VM406:2 2
+VM406:2 [
+VM406:2 o
+VM406:2 b
+VM406:2 j
+VM406:2 e
+VM406:2 c
+VM406:2 t
+VM406:2  
+VM406:2 O
+VM406:2 b
+VM406:2 j
+VM406:2 e
+VM406:2 c
+VM406:2 t
+VM406:2 ]
+
+b.indexOf('o')
+2
+a.replace('o', 'p')
+"12"
+b.replace('o', 'p')
+"2[pbject Object]"
+b.replaceAll('j', 'i')
+"2[obiect Obiect]"
+b.slice(1,5)
+"[obj"
+let array1 = [1, 2, 3];
+undefined
+let array2 = Array.from(array1);
+undefined
+array1
+(3) [1, 2, 3]
+array2
+(3) [1, 2, 3]
+let array3 = array1.concat(array2);
+undefined
+array3
+(6) [1, 2, 3, 1, 2, 3]
+array3[3] = 4 
+4
+array3
+(6) [1, 2, 3, 4, 2, 3]
+array3[10] = 10
+10
+array3
+(11) [1, 2, 3, 4, 2, 3, empty × 4, 10]
+array3.push(11)
+12
+array3
+(12) [1, 2, 3, 4, 2, 3, empty × 4, 10, 11]
+array3.splice(1, 0, 5)
+[]
+array3
+(13) [1, 5, 2, 3, 4, 2, 3, empty × 4, 10, 11]
+array3.splice(1, 10)
+(10) [5, 2, 3, 4, 2, 3, empty × 4]
+array3
+(3) [1, 10, 11]
+array3.reverse()
+(3) [11, 10, 1]
+array3.sort()
+(3) [1, 10, 11]
+let myObj = {'a':1, 'b':2}
+undefined
+let myObj2 = {'c':3, 'd':4}
+undefined
+Object.assign(myObj, myObj2)
+{a: 1, b: 2, c: 3, d: 4}
+Object.keys(myObj2)
+(2) ["c", "d"]
+Object.values(myObj2)
+(2) [3, 4]
+Object.defineProperty(navigator, 'webdriver', {value:true, writable:true})
+Navigator {webdriver: true, vendorSub: "", productSub: "20030107", vendor: "Google Inc.", maxTouchPoints: 0, …}
+navigator.webdriver
+true
+JSON.stringify(myObj2)
+"{"c":3,"d":4}"
+JSON.stringify(myObj)
+"{"a":1,"b":2,"c":3,"d":4}"
+
+new Date()
+Sun May 02 2021 20:48:17 GMT+0800 (China Standard Time)
+let current_time = new Date()
+current_time.toISOString()
+"2021-05-02T12:48:42.202Z"
+current_time.getTime()
+1619959722202