javascript4

时间:2023-01-11 17:46:04

javascript使用Unicode字符集编写的。javaScript是区分大小写的语言。

标示符就是一个名字。在javascript中用标示符来对变量和函数进行命名或者用做javascript代码中某些循环语句中的跳位置的标记。javascript标示符必须以字母、下划线、美元福$开始,后续的字符可以是字母,数字,下划线,美元符号(数字不允许首字母出现,以便区分开标示符和数字)。

保留字

编程语言最基本的特性:支持多种数据类型,变量(variable)的工作机制是编程语言的另一个特性。

javascript数据类型:原始类型和对象类型。

  原始类型(primitive type)包括数字,字符串和布尔值;特殊的原始类型:null(空)和undefined(未定义)。

  对象是属性的集合。普通的对象是“命名值”的无序集合;特殊对象——数组,表示带编号的值的有序集合;特殊对象——函数,函数是具有与它相关联的可执行代码的对象,通过调用函数来运行可执行代码,并返回运算结果;如果函数用来初始化(使用new运算符)一个新建的对象,称之为构造函数(constructor);日期类——日期的对象;正则类——正则表达式(一种强大的模式匹配工具)的对象。

javascript的类型:可以拥有方法的类型和不能拥有方法的类型;可变类型(mutable)和不可变类型(immutable)(可变类型的值是可以修改的。javascript可以更改对象属性值和数组元素的值;数字布尔值、null、undefined属于不可变类型,字符串也是不可变的。)

javascript解释器有自己的内存管理机制,可以自动对内存进行垃圾回收。

javascript是一种面向对象的语言。

javascript中只有null和undefined是无法拥有方法值的。

javascript变量是无类型的,变量可以被赋予任何类型的值,同样一个变量也可以重新赋予不同类型的值。

包装对象:存取字符串、数字或布尔值的属性时创建的临时对象。它只是偶尔用来区分字符串值和字符串对象、数字和数值对象以及布尔值和布尔对象。包装对象只是被看做是一种实现细节,而不用特别关注。由于字符串、数字、布尔值的属性是只读的并且不能给他们定义新属性,他们是有别与对象的。可以通过String()、Number()、Boolean()构造函数来显式创建包装对象。

javascript会在必要时将包装对象转换成原始值。

javascript采用词法作用域(lexical  scoping):

  全局变量(global  variable):不在任何函数内声明的变量,它在javascript程序中的任何地方都是可见的。

  在函数内声明的变量具有函数作用域(function scope),并且只在函数内可见。

数字:javascript不区分整数值和浮点数值。javascript中所有数字均用浮点数值表示。

  数字直接量(numeric literal):一个数字直接出现在javascript程序中。

javascript程序是使用 本身提供的算数运算符来进行数字运算的。基本的算术运算:+、—、*、/、%(求余:整除后的余数);复杂运算符:通过为Math对象的属性定义的函数和常量来实现。

console.log(Math.pow(2,3))//8   2的3次幂
console.log(Math.round(.6))//1 四舍五入
console.log(Math.ceil(.6))//1 向上求整
console.log(Math.floor(.6))//0 向下求整
console.log(Math.abs(-5))//5 求绝对值
console.log(Math.max(1,2,7))//7 返回最大值
console.log(Math.min(8,3,9))//3 返回最小值
console.log(Math.random())//0.2526274783389907 生成一个大于等于0小于等于1.0的伪随机数
console.log(Math.PI)//3.141592653589793
console.log(Math.E)// 2.718281828459045
console.log(Math.sqrt(3))//1.7320508075688772
console.log(Math.pow(3,1/3))//1.4422495703074083
console.log(Math.sin(0))//
console.log(Math.log(10))// 2.302585092994046
console.log(Math.log(100)/Math.LN10)//2
console.log(Math.log(512)/Math.LN2)//9
console.log(Math.exp(3))// 20.085536923187668

javascript中算数运算在溢出(overflow以Infinity表示)、下溢(underflow将返回0)或被零整除时不会报错(简单的返回无穷大或负无穷大;0/0是NaN;无穷大除以无穷大、给任意负数做开放运算或算数运算符与不是数字或无法转换为数字的操作数一起使用时都将返回NaN)。

console.log(Infinity)// Infinity
console.log(Number.POSITIVE_INFINITY)// Infinity
console.log(1/0)// Infinity
console.log(Number.MAX_VALUE+1)// 1.7976931348623157e+308
console.log(Number.NEGATIVE_INFINITY)// -Infinity
console.log(-Infinity)// -Infinity
console.log(-1/0)// -Infinity
console.log(-Number.MAX_VALUE-1)//-1.7976931348623157e+308
console.log(NaN)//NaN
console.log(Number.NaN)//NaN
console.log(0/0)//NaN
console.log(Number.MIN_VALUE/2)//0
console.log(-Number.MIN_VALUE/2)//-0
console.log(-1/Infinity)//-0
console.log(-0)//-0
        console.log(zero=0)//
console.log(negz=-0)//-0
console.log(zero===negz)//true
console.log(1/zero===1/negz)//false
     console.log(0.3-0.2==0.2-0.1)//false

javascript语言核心包括Date()构造函数,用来创建表示日期和时间的对象。

字符串直接量

javascript的内置功能之一就是字符串连接。

var s="hello,word"
console.log(s.charAt(0))//h
console.log(s.charAt(s.length-1))//d
console.log(s.substring(1,4))//ell(位置和长度)
console.log(s.slice(-3,-1))//or(两个位置。不包含结尾的元素。负值从右边第一个为-1。不改变原数组)
console.log(s.indexOf("9"))//-1没有找到返回-1
console.log(s.indexOf("o"))//4区别于判断类型instanceof,typeof
console.log(s.indexOf("o",2))//4从第三个位置开始o开始出现的位置
console.log(s.split(","))//["hello", "word"]
console.log(s.split("",0))//[]从“”切分处的字符串或正则表达式返回0长度的数组

javascript定义了RegExp()构造函数,用来创建表示文本匹配模式的对象。这些模式称为“正则表达式”(regular expression).string和RegExp对象均定义了利用正则表达式进行模式匹配和查找与替换的函数。

布尔值指代真假、开关、是否。

任意javascript值都可以转换为布尔值。

undefined,null,0,-0,NaN,""(空字符串)会被转换成false。布尔运算符号:toString();与&&AND,或||OR,非!NOT;

null是javascript语言的关键字,他表示一个特殊值,常用来描述“空值”。null是一个特殊的对象值,含义是“非对象”。他可以表示数字,字符串和对象是”无值“的。

undefined是预定义的全局变量(它和null不一样不是关键字)它的值是未定义。

全局对象初始属性(不是保留字,但他们应该当做保留字来对待):全局属性(undefined、infinity、NaN),全局函数(isNaN()、parseInt()、eval()),构造函数(Date()、RegExp()、String()、Object()、Array()),全局对象(Math和JSON)

javascript对象是一种复合对象:它是属性或已命名值的集合。通过”.“符号来引用属性值。当属性值是一个函数的时候,称其为方法。通过o.m()来调用对象o中的方法。

字符串也同样具有属性和方法。

显式类型转换最简单的方法:Boolean()、Number()、String(),或者Object()函数。除了null或者undefined之外的任何值都具有toString()方法。这个方法的执行结果通常和String()方法返回结果一致。把null和undefined转换为对象,则抛出一个类型错误。(TypeError)。

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" 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" alt="" />(注意十六进制是0x是'数字零和字母x')

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" 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" alt="" />

转换和相等性:(比较之前都转化成了数字)

console.log(null==undefined)//true
"0"==0//true
0==false//true
"0"==false//true

所有对象继承了两个转换方法:

  toString()作用是返回一个反映这个对象的字符串:

    数组类(Array class)的toString()方法将每个数组元素转换为一个字符串,并在元素之间添加逗号后合并成结果字符串。

    函数类(Function class)的toString()方法返回这个函数的实现定义的表示方式。(通常是将用户定义的函数转化为javascript源代码字符串)

    日期类(Date class)定义的toString()方法返回了一个可读的(可被javascript解析的)日期和时间字符串。

    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" 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    RegExp类(RegExpclass)定义的toString()方法返回了将该对象转换为表示正则表达式直接量的字符串。

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" alt="" />

  转换对象的函数valueof()它就默认将对象转换为表示它的原始值。

    数组、函数、正则表达式调用这些类型的实例的valueof()方法只是简单的返回对象本身。

    日期类定义的valueof()方法会返回他的一个内部表示。

日期类是javascript语言核心中唯一的预先定义类型,他定义了有意义的向字符串和数字类型的转换。

aaarticlea/png;base64,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" alt="" />

aaarticlea/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIkAAAB1CAIAAAD1FlX8AAAMXklEQVR4nO2de1BTVx7HGf3Dmc5sO2tn6kxr67g7td3Rjrttd6m1bp1Wtw+7lbG16NppVVpqdXaKthYftSWIIMtWcFFbFayiGCGIKGIFKqICBh88AgXC+xFIAnkQIO/kfvePm8njcoMREjjY85n8dXLv/d1zPzn3nJucX04QCEGtxrp1aG2d6PMYLZGRKC727yGD/Hu4+6avD8HBCArCnDnIyADDTPD5jJoH0A3FO1w3/RRioO2GXKgbcqFuyIUsNwwQdwMpFeMXUWXAigy0aMYvou/wuJEPYlk6ZAOBDdzRjwUpmCLAI3EQyxyFp2uwNA1aY0Ai9ukRfQ0zEhAq8igPaNCxwONGNoCFqQF3IyjGFz/DbHOVyAfx6k+oUgQw4vZfsPky143Fjo/OIUkcqLijhusmVISgKNcrVAStEYuOoajNsUF4Lv5bBgCfXkBkIWYkYNpuxN0AAzBAWjVmJGCqAMuF6B4AAK0R72diqgAP7cG3V10yQkXIqvMIfbwK/zoL94dP9xD/KQUABki8iYfjMFWAJWnoHkBZF5alY9Ds2EUsw1unoDN5rbCgmOsGwPUOvPoTcU3Hp3YTWYgt+QCgHMLrJ9CkBoBQERakoL0fNUrM/wESJSrleFcIlQFmG3ZcwaY8MMCGi9hwEXoLmjV4/jAuSCEo5upn+TAbqZ49jTPElVa8cBjKIeQ14sUjaNZAb8GGi/jkAhrVePMU+vRYnYVLTbjUhA+zR6owrxvlEF45Bony/q5doPHJTaUcr52A2oALUnxT5Ch0fvAtdiwXIqcB+8Xci642YPFx3Olx7CIohqCYu7uTEUqcp7QlH7E3HO+yTaRFg6VpuNuDd04j5jqy6rCryBGLPY2nEj3qwutGZ8Jbp1zdHiH45MZix5qzuNKKb4rQoHIUOi+cwYq303GpCbE3HM3LyX254W0393SjHMJ7GUgSI0mMiMv4Mp97EA7e2s3i42hUj7Tj+MPjRjmEFw7jcrNHoehXvJeBqGJXfxAqwslqMMD5BryUAvkgrnfg2QMol7m2sdixIgNf5kNvQYMKcw+ioMW1O8dNagVWZ3n0N8PdHK/C346ivR96Cz7MxqY8AFiXgzVnIZZhawFeOIxLTSNVmNfNPXupCYHHjbO/de8MegYx9yAuSF2bsaOGKQL86QBud7t2fDTecTNhL2tHP145hqkCPByHxJseajluegbx1yMeN5bhbsw2bMnHQ3swVYD3Mx29t6AYzx6AcgiiX/FovKuZcuD0c87oDLAxbzKM03hhgFwpVmVBb3EVDr+4Y2dCHjUm0/MNB7EMv9+LBSno6PcoD4QbBth9DUfv+vmwIzDJvhegEAJ1Qy7UDblQN+RC3ZALdUMuPG6EQmFERIREIgkJCWlqGvEh2wcUwnSFMH10+0ql0uXLl0skkoiIiMzMzDGeyaSDx01mZmZ8fHxnZ2doaOjEumlqalq/fr1Codi+fTt1AwDZ2dnx8fFqtXrTpk1yuRyAQpjecyy1ZuWK0tlPdiXvZ6xWAG0x0bqyUgBWtUq6cYNVrWqPjWmLEdx68c89qUdrV61s2bmNMZkUwvT2PbtrV39QOvvJzqR97L6D1VU1K1eUPvV4/SfrTF2dAHRlpU1bIlqjvi2d/WTtqpVmhQJAa2trWFiYWq2Oj48vKioafqoPNj71NwphevXyZcaWFlO37NeP1pg62sHnpi0muuHzcPXPeXcXvay9XtzwebhVrXLua9Vq68PDBu7esWo0zdu/NnXLYLdrCgtad+1kzGZdWWnF4kW6W+WM1So7dFAp+s21kuH46oa9L9kN+uZtWw2NUnhxoyks0JWVtkVHWVR9bKH7Pa376GGlKHPg7p2bT88uefwx9iXduMFu0OvKSttiogNWzUmJH9xY+nrZJsKWsFfZKczdTdf+RE1hga5c3LprJ3tzc0LdDGf0bjri43rPiuxGY0d8XNWyN0dwIz9xHAxjaG6uD1trbGszy+W1qz/QiW/CbneGoG6GM3o3emlDxeJF5fPndv0vqT5srTc36oL828Evljz+WMVrr+rKHT+S6MrFlW8sYe9p7JGpm+HQZ09yoW7IhbohF+qGXGhuFLnQdkMu1A25UDfkQt34SosGf9iPk9XjF/EBcbPvJvaW3GOb7gGEnMG03QiKwsJU1wzbz3Jxrv7eIaibUeI+C94b4bmObBMOgZgE6Re4bmQDCDmD9ecxbTee+N4xt3h4fpOwxiPNJauOZwK4N/wbQizDI3GuWc7ODMWcBsxIwBQBnjvkSKwJFeG7qx5z4bPqPGZIs9kgsgG8lIKIy3g4Dg/tgbAGcJtL7bQ4ci04qUWjg8fNrER8XYghC74qQHguf35TURs+EEFlwLJ0SJTYL4agmFtV9sw4iXBZdWMK4Q1Ou6lSYO5BlMtgY5BQiiVp0Ftwuxt/3I/nDyO7HjY3RZx2IxvA7CRs+wUDZuQ14o2TrqQ49y2H1wJA7A3HrPGrbXg5FX360UlxwOPGmXzDflR5c2gkSrwrRGkn/nESadUQFDs+X74QiBAcN6kVrjbnHs5sQ0Yt5iTj9ROuyenD3XhLd+W44dQCnm6Cj0I55Os14WWUbpRDWJqG5HIcvoOvCvDxORS13Ue7GXUIb/johqVXj/k/uK6yH91ckOKxBEwVYEYCchq8nq2P3NsNb37ToBkhZ/DxOUhV+Ogcgo/eR7LkGENY7FiXg/k/QD7oOuZ+Mf552tXPs1lad3pgY/DdVbxzGga3X1klSjx7wJWlFZ6LzZddd7mxuAkV4XgV/PVfVvd2Ay/5TaEiLE2DwQpBMWYnoWcQPjLGELxuOP9W4MzSmiJwZKfoTFiY6mi7T3yPQ7ddV/B2N+Yke4wFhrtxb/1sCN5aJJe7NpuRgLxGX68JLw/IGJoEtEa8lILTNQBgtCLsvGOAMGqoG79hsWNviSOlctpuhJxx/MPCqKFuyIW6IRfqhlyoG3KhbsiFuiEXfjeqXuvWTzuf+V310vn1zQ38fyWSfUozM6hyZlDlrZKxfW1E8QK/m+xTmhOH+jxnk/OTGC2nbgIEvxvOFW9uMC2dXz8zqDJ4Vu3ZkxqbjX9LhsHP5/rfCZbODKpc80azRmUDYDQwKUm9wbNqlzxXnyPU+OKbwsJ147xTsa/EaLn7u1qNbde/u7razc4SdzcalW3z2g73dwFcyu4/e1Jjt0Orse3Y2FVbaQhMRR5AfGo3ql7rtg2d86ZLZgZVcnog9y1NJmafQL5pdXvZ1UGjgQFgNjNRm2XusukN0Hd8cnNkX29itNxkYowGJmZrtzc3AOx2dLWbj+zrXbWkubXRZDQy0V9211WT9x9LkwGf3CTHKk4c6rNYmF8u6lYubhrBDYvVividPWz56RTV3h09Azo7KPeJr2OB0Neb5k2XCLbItn7SybpJjJY771Tsjc59yLAvSq4fsgPQD9n3RcmDZ9W6DxAovkCfPcmFuiEX6oZcqBtyoblR5ELbDblQN+RC3ZDLOLkZ/wWhrrQiPNdjfZ1Jxzi5Gf8Focw2rM1B9DW/zYAdf/zpxsZg82VkD8sBm6gFodq0WJASwLiBxs+5UQ0q/OVH/HjH49PKWRAqQOlXvAt0RBYistDXa0Ea/syNYukewCvHEH3NNTOfs7BNIHKj4MXNpSa8ne6RRDCJCEhuVKcOT//PtYjQCAkuowjhnNLvnk+LSbWwjY/4MzeKxZd24/fcKHhvNysyYJmcPx75OTeKt7/hLAgVoPQrXje+5E8Tiz9zo7yN0zgLQvk9/crbglCBHh8Gmgfh+YYX+nzjK+O/IBT9XoASQKgbcqFuyIW6IRfqhlyoG3LhcaPV2PZEdtMJmBMOjxuNyhb5WSd1M+Fw3bjPcnbm39wqGfr2C1nCrp550yWfrWzrVVjhNmfa6ZJhUHJlcMWixnnTJXt39GjV1O6Y8Knd3CoZClnYWCHWW604ltx3/owWfG46Ws17d/QMDtitVmT8pD6W3Ddu1Xgg8dUNJ4ENfG7yz/ePkPNGuV/84IZNqtaobOfPaE/+qAro6f6m4HGj67dFfNwhuetKzOR1kxyryM3UmkxMcqyCTaxpqDWGv9/WIjUxk/e7X5LgccOmOy95rt59LDDcTXODKWRh49+fqTua2Lt5bQc7FnDmSdPUzrFDnz3JhbohF+qGXKgbcqG5UeRC2w25UDfkQt2QC3VDLtQNuVA35ELdkAt1Qy7UDblQN+RC3ZALdUMu1A25UDfk8n+EVNx17H5rpwAAAABJRU5ErkJggg==" alt="" />

作用域:

scope="gloabal";
function checkscope2(){
scope="local";
myscope="local";
return [scope,myscope];
}
checkscope2();
console.log(scope)//local
console.log(myscope)//local
var obj = {a:1,b:2};
for(x in obj)
{
alert(x);
alert(obj[x]);
}//a,1,b,2
var scope="gloabal";
alert(1)
function checkscope(){
alert(3)
var scope="local scope";
function nested(){
alert(5)
var scope="nested scope";
alert(6)
return scope;
alert(7)
}
alert(4)
return nested();
alert(8)
}
alert(2)
checkscope();//1,2,3,4,5,6

变量声明和变量作用域:

函数作用域和声明提前:

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