js 0.0

2021-01-28 09:06:45 +08:00
parent f230cfc37f
commit 5d39890424
18 changed files with 1380 additions and 0 deletions
--- a/js/demo/day2.html
+++ b/js/demo/day2.html
@@ -0,0 +1,70 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+    <script>
+        var a=1;
+        a+=2;
+        // a=+3
+        // console.log(a)
+        // var b=1;
+        // console.log(b++)  //1   先执行  后增加
+        // console.log(b)  //2
+        // console.log(++b)    //3   先增加  后执行
+
+        // console.log(true>2)
+        // console.log(false>true)
+        // console.log(undefined ==null )
+        // console.log(undefined === null)
+        function s(){
+            console.log("hello world")
+            return false
+        }
+        function r(){
+            console.log("js")
+            return true
+        }
+        function e(){
+            console.log('queen')
+            return true
+        }
+        // q=s()||r()||e()
+
+        // q=fasle||true
+        // s false  r true
+        // s hello world    r  js
+        // true
+        
+        var time=1;
+        var date=2
+        df=r()&&s()&&e()
+
+        // df2=r()&&e()
+        // console.log(df,df2)
+        // console.log(time==1 && date==2)
+        // console.log(time==1&& date==='2')
+
+        var ad=(2>1)?1:2
+
+        // function abc(){
+        //     console.log('abc')
+        //     return 1
+        // }
+        // var abc=function(){
+        //     console.log("abc1")
+        //     return 2
+        // }
+
+        var abc=()=>{
+            console.log("abcn")
+            return 3
+        }
+        abc()
+    </script>
+</head>
+<body>
+    
+</body>
+</html>