diff --git "a/\347\216\213\351\221\253\346\272\220/20251110-\345\210\235\345\247\213js.md" "b/\347\216\213\351\221\253\346\272\220/20251110-\345\210\235\345\247\213js.md" new file mode 100644 index 0000000000000000000000000000000000000000..742e73e00bc1f227b177712e90db27e44d485ed3 --- /dev/null +++ "b/\347\216\213\351\221\253\346\272\220/20251110-\345\210\235\345\247\213js.md" @@ -0,0 +1,74 @@ +# 笔记 + + -初识js + ``` +JS易学难精,三种用法 +1.在页面插入Js代码 +2.链接js文件 +3.作为标签值使用 + ``` + + - 简单计数器程序要点 + ``` +用id绑定变量(let 变量名) 需要注意避免命名冲突,如click +用class绑定函数(function 函数名) + ``` + + + +# 练习 + +1、 + +效果图 + +![image-20251117002855975](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117002855975.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +2、 + +效果图 + +![image-20251117003214042](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117003214042.png) + +代码 + +```html + + + + + + Document + + + + + +``` + +js文件 + +```js +alert("http://www.mingrisoft") +``` + diff --git "a/\347\216\213\351\221\253\346\272\220/20251112-js\346\225\260\346\215\256\347\261\273\345\236\213.md" "b/\347\216\213\351\221\253\346\272\220/20251112-js\346\225\260\346\215\256\347\261\273\345\236\213.md" new file mode 100644 index 0000000000000000000000000000000000000000..0661cc9adf7376a5748492abfe3608a67f2ee15b --- /dev/null +++ "b/\347\216\213\351\221\253\346\272\220/20251112-js\346\225\260\346\215\256\347\261\273\345\236\213.md" @@ -0,0 +1,320 @@ +# 笔记 + +- 数据类型 +``` +当js引用外部js时,本身的js会被覆盖掉 + +1/0时超出范围,出现Infinity +0/0时结果非数字,出现NaN + +定义常量: Const + 大写字母; +变量:小驼峰,命名方式; +用let不用var,因为var的循环不回收; +``` + +## 打印的两种方法 +``` +控制台打印 console.log('文本') +页面打印 document.write('文本'); +``` + + + +# 练习 + +1、 + +效果图 + +![image-20251117003541219](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117003541219.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +2、 + +效果图 + +![image-20251117003657514](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117003657514.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +3、 + +效果图 + +![image-20251117003742589](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117003742589.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +4、 + +效果图 + +![image-20251117003852713](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117003852713.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +5、 + +效果图 + +![image-20251117003951360](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117003951360.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +6、 + +效果图 + +![image-20251117004031119](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117004031119.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +7、 + +效果图 + +![image-20251117004117710](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117004117710.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +8、 + +效果图 + +![image-20251117004206403](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117004206403.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +9、 + +效果图 + +![image-20251117004242519](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117004242519.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +10、 + +效果图 + +![image-20251117004325215](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117004325215.png) + +代码 + +```html + + + + + + Document + + + + + +``` + diff --git "a/\347\216\213\351\221\253\346\272\220/20251113-js\350\277\220\347\256\227\347\254\246\345\222\214\346\265\201\347\250\213\346\216\247\345\210\266\350\257\255\345\217\245.md" "b/\347\216\213\351\221\253\346\272\220/20251113-js\350\277\220\347\256\227\347\254\246\345\222\214\346\265\201\347\250\213\346\216\247\345\210\266\350\257\255\345\217\245.md" new file mode 100644 index 0000000000000000000000000000000000000000..f80eb32e4e9260d823291f780ffe6422ff8c9c7d --- /dev/null +++ "b/\347\216\213\351\221\253\346\272\220/20251113-js\350\277\220\347\256\227\347\254\246\345\222\214\346\265\201\347\250\213\346\216\247\345\210\266\350\257\255\345\217\245.md" @@ -0,0 +1,125 @@ +# 笔记 + + - 运算符 + + - 等于和绝对等于的区别 + + ``` +== 只根据表值判断,不涉及数据类型 +===绝对等于,同时根据表面值和数据类型进行判断 + ``` + - 逻辑运算符 + +``` +&&逻辑且,两边只要有一个false最终就是false +||逻辑或, 有一个true就是true +``` + + - 三元运算 + +``` +let 变量=表达式? "前文本":"后文本"; +若满足表达式,变为前文本 +``` + - 判断数据类型 + +``` +type of 变量 判断数据类型 +``` +``` +如下数据,在参与逻辑运算的时候,都会被当成 false 对待,其它的都被当成 true 对待: +0 false null underfind +``` + + + +# 练习 + +1、 + +效果图 + +![image-20251117004747262](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117004747262.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +2、 + +效果图 + +![image-20251117004821977](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117004821977.png) + +代码 + +```html + + + + + + Document + + + + + +``` + diff --git "a/\347\216\213\351\221\253\346\272\220/20251114-js\345\276\252\347\216\257\350\257\255\345\217\245.md" "b/\347\216\213\351\221\253\346\272\220/20251114-js\345\276\252\347\216\257\350\257\255\345\217\245.md" new file mode 100644 index 0000000000000000000000000000000000000000..e853da96670633cb7b0e648679db368511ed1a65 --- /dev/null +++ "b/\347\216\213\351\221\253\346\272\220/20251114-js\345\276\252\347\216\257\350\257\255\345\217\245.md" @@ -0,0 +1,127 @@ +# 笔记 + +- 给用户的输入弹窗 + +``` +prompt("文本") +``` + +- JS打印表格 + +``` +用document.write打印在body里写的原格式 +``` + + + +# 练习 + +1、 + +效果图 + +![image-20251117005017284](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117005017284.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +2、 + +效果图 + +![image-20251117005108221](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117005108221.png) + +代码 + +```html + + + + + + Document + + + + + +``` + + + +3、 + +效果图 + +![image-20251117005214018](C:\Users\saber\Desktop\grade24-class2-note-javascript\王鑫源\效果图\image-20251117005214018.png) + +代码 + +```html + + + + + + Document + + + + + + + +``` + diff --git "a/\347\216\213\351\221\253\346\272\220/\346\225\210\346\236\234\345\233\276/image-20251117002855975.png" "b/\347\216\213\351\221\253\346\272\220/\346\225\210\346\236\234\345\233\276/image-20251117002855975.png" new file mode 100644 index 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