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多了一个占有列表。这里占有列表是[unown","htmlelement类产生了类实例和ashtml","htmlelement类只提供一个构造函数通过name和text(如果有的话)参数来初始化一个元素。该类也定义了一个析构函数当htmlel","htmlelement类定义了一个name属性来表示这个元素的名称例如代表段落的&quot;p&quot;,或者代表换行的&quot;br&quot;。htmlelement还定义了一个可选属性text用来设置和展现html","htmlelement还定义了一个lazy属性ashtml。这个属性引用了一个闭包将name和text组合成html","http","http200statu","http200status.descript","http200status.statuscod","http404error","http404error.0","http404error.1","human","hundr","iboutlet和ibinspectable用于修饰一个类的属性声明ibaction特性用于修饰一个类的方法声明ibdesign","identifi","identifier-charact","identifier-head","identifier-list","identifier-list­function-result­(opt)­in","identifier-pattern","identifier-patterntype-annotationopt","identifier­:­express","identifier­generic-argument-clause­(opt","if-condit","if-stat","if和let来处理值缺失的情况。有些变量的值是可选的。一个可选的值可能是一个具体的值或者是nil","if和switch来进行条件操作使用for-in、for、while和do-whil","if和while语句中来对可选的值进行判断并把值赋给一个常量或者变量。if和whil","if或els","if语句中条件的值的类型必须遵循logicvalu","if语句中条件必须是一个布尔表达式——这意味着像if","if语句允许二选一也就是当条件为假时执行els","if语句和switch","if语句和switch语句。通常当条件较为简单且可能的情况很少时使用if语句。而switch语句更适用于复杂的条件、可能的情况很多且需要用到模式匹配(pattern-match","if语句来判断一个可选是否包含值。如果可选有值结果是true如果没有值结果是fals","if语句用于判断是不是特别热。而最后的els","if语句的第一个分支中操作actualnumber的值你可以改成if","ignor","illustr","imag","img","immedi","implement","implicit","implicit-member-express","implicit-parameter-nam","implicitdoubl","implicitinteg","implicitli","implicitly-unwrapped-optional-typ","implicitlyunwrappedoptional<str","implicitlyunwrappedstr","import","import-declar","import-kind","import-path","import-path-identifi","in-out","in-out-express","in-out参数交换a和b的值这两个参数被描述为[in-out类型参数][1","in-out参数可以在参数类型前加inout前缀。但是你不可以对可变长参数或返回值类型使用inout。关于in-out参数的讨论见章节in-out","inch","includ","incorrect","increment","increment(7","incrementbi","incrementby(amount","incrementbyseven","incrementbyseven和incrementbyten","incrementbysevne捕获了一个新的runningtotal变量该变量和incrementbyten","incrementbyten","incrementbyten的常量该常量指向一个每次调用会加10的incrementor","incrementforcount(count","incrementforcount不能被调用时,尝试使用可选属性``fixedincr","incrementforcount方法后,int型可选值通过可选绑定(opt","incrementor","incrementor从上下文中捕获了两个值runningtotal和amount","incrementor函数并没有获取任何参数但是在函数体内访问了runningtotal和amount变量。这是因为其通过捕获在包含它的函数体内已经存在的runningtotal和amount","incrementor时其会以amount作为增量增加runningtot","incrementor其会有一个属于自己的独立的runningtot","increment方法通过可选链,尝试从两种可选成员中获取count","increment表达式然后转到第2","index","indexisvalidforrow(row","indic","individu","individualscor","infer","infix","infix-operator-attribut","infix-operator-declar","inform","inherit","inheritingprotocol","init","init(area","init(cent","init(coin","init(greet","init(leg","init(nam","init(numb","init(radiu","init(row","init(s","init(sid","init(sidelength","init)来代替之前版本中的setup操作.构造器中含有一个名为generator,类型为randomnumbergenerator的形参,使得它可以接收任意遵循randomnumbergener","init/subscript","initi","initialbit","initializer-bodi","initializer-declar","initializer-express","initializer-head","initializers)和成员级构造器(memberwis","initializers那么对于来自你的扩展构造器中的值类型你可以调用默认构造器(default","initializer表达式用来给某个typ","initialsquarecent","initialz","initialzation、condition和increment之间的分号以及包围循环体stat","initialzation中的变量仅在for语句的作用域以内有效。condition表达式的值的类型必须遵循logicvalu","inout","inout。如何使用assign","inout标记。如果你用inout标记一个参数这个参数不能别var或者let","input","insert","insert(atindex","insert函数调用把值为&quot;mapl","insid","inspir","instanc","instead","instruct","int","int&gt","int&gt;。字典实例创建完成之后通过下标的方式将整型值2赋值到字典实例的索引为bird","int&gt;就是用具体的string和int类型替代泛型类型keytyp","int&gt;引用命名型类型dictionary&lt;str","int(generator.random","int(pi","int(spe","int)(b","int))包含两个元素第一个是命名型类型int第二个是另一个复合型类型(int","int)——也就是说一个函数传入一个int然后输出作为另一个函数的输入然后又返回一个int。例如你可以使用如下嵌套函数来重写柯里化函数addtwonumb","int)或者(str","int)类型的元组中使用值绑定来分类下图中的点(x","int)类型的元组来分类下图中的点(x","int)只匹配两个元素都是int这种类型的元组。如果仅需要限制一个元组模式中的某几个元素只需要直接对这几个元素提供类型注释即可。例如在let","int,double,str","int...。可变长参数被认为是一个包含了基础类型元素的数组。即int...就是int","int16","int16.max","int8","int8.max","int8.min","int8类型的常量或者变量可以存储的数字范围是-128~127uint8类型的常量或者变量能存储的数字范围是0~255","int[](count","integ","integer-liter","integerpi","integersoverflow","integers对无符整型进行移位shift","integertodescrib","integertodescribe的值不属于列表中的任何质数那么它不会匹配到第一个switch分支。而这里没有其他特别的分支情况所以integertodescribe匹配到包含所有的default","integervalu","integer","intend","interact","interestingnumb","interfac","intern","interpol","interpolation的方式把常量名或者变量名当做占位符加入到长字符串中swift会用当前常量或变量的值替换这些占位符。将常量或变量名放入反斜杠符加一对圆括号中&quot;\\()&quot","intstack","intstack指定了container的实现适用的itemtype被用作int类型。对于这个contain","intstack类型只能用于int值不过其对于定义一个泛型stack","intstack类型实现了container协议的所有三个要求在intstack","intstack类型的非泛型版本适用于遵循contain","intuint浮点数类型安全和类型推测数值类原始值数值类型转换整数转换整数和浮点数转换类型别名布尔值元组可选if","int。swift","int值没有足够的位数即下标越界那么上述实现的下标会返回0因为它会在数字左边自动补0","int值类型的数组我们不能往其中插入任何不是int","int值都可以找到一个匹配的行星。正因为如此fromraw方法可以返回一个可选的枚举成员。在上面的例子中possibleplanet是planet?类型或“可选的planet","int值不论使用了多少层链接返回的总是int","int可以被理解为int","int和double均满足compar","int型的变量来调用swaptwoints。需要注意的是someint和anotherint在传入swaptwoints函数前都加了&amp","int就够了。这可以提高代码一致性和可复用性。即使是在32位平台上int可以存储的整数范围也可以达到-2147483648~2147483647","int引用命名型类型int同样类型标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