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71、对象的使用 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // 1、声明对象 // let pink = { // uname: 'ren', // age: 18, // gender : '男' // } // // 改 把性别女改为男 // pink.gender = '女' // console.log(pink) // // 增 // pink.hobby = '足球' // console.log(pink) // // 删 // delete pink.age // console.log(pink) // console.log(pink) // console.log(typeof pink) let obj = { name:'小米10青春版', num:'100012816024', weight: '0.55kg', address: '中国大陆', } obj.name = '小米10Plus' obj.color = '粉色' console.log(obj.name) console.log(obj.num) console.log(obj.weight) console.log(obj.address) console.log(obj.color) // 查的另一个属性： // 对象名['属性名'] // 查总结： // (1) 对象名.属性名 obj.age // (2) 对象名['属性名'] obj['age'] // // 2、使用属性 查 对象名.属性名 // console.log(obj.address) // console.log(obj.name) </script> </body> </html> -
70、转换为布尔型 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // 有字符串的加法 "" + 1 结果是 "1" // 减法-（像大多数数学运算一样）只能用于数字，它会使空字符串 ""转换为0 // null 经过数字转换之后变为0 // undfined 经过数字转换之后会变成为 NaN console.log(Boolean('pink')) console.log(Boolean('')) //false console.log(Boolean(0)) //false console.log(Boolean(-1)) //true console.log(Boolean(undefined)) //false console.log(Boolean(null)) //false console.log(Boolean(NaN)) //false console.log('-------------------------------') if(true){ console.log(11) } </script> </body> </html>
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69、逻辑中断 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> function fn(x, y){ console.log(x + y) } fn(1, 2) </script> </body> </html>
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68、综合案例 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // 1、用户输入 let second = +prompt('请输入秒数:') // 2、封装函数 function getTime(t){ // console.log(t) //总秒数 // 3、转换 let h = parseInt(t/ 60 / 60 % 24) //小时 let m = parseInt(t/ 60 % 60) //分钟 let s = parseInt(t % 60) //秒数 h = h < 10 ? '0' + h : h m = m < 10 ? '0' + m : m s = s < 10 ? '0' + s : s // console.log(h,m,s) return `转换完毕之后是${h}:${m}；${s}` } let str = getTime(second) document.write(str) </script> </body> </html>
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67、立即执行函数 <!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> </head> <body> <script> // let num = 10 // let num = 20 // (function(){ // console.log(11) // })() // (function(){ // let num = 10 // })(); // (function(){ // let num = 20 // })(); // 1、第一种写法 (function(x, y){ console.log(x + y) })(1, 2); // (function(){})(); // 2、第二种写法 (function(){}()); (function(x, y){ console.log(x + y) }(1, 3)); </script> </body> </html>
