函数是 JavaScript 中的基本组件之一。JavaScript 中的函数类似于过程——一组执行任务或计算值的语句。但要成为函数,这个过程应该接受输入并返回与输入存在某些明显关系的输出。要使用一个函数,你必须将其定义在你希望调用它的作用域内。 参见JavaScript 函数的详细参考章节,以了解详情。 定义函数 函数声明 一个函数定义(
要在字符串中插入反斜杠字面量,必须转义反斜杠。例如,要把文件路径赋值给一个字符串,可以采用如下方式: js consthome="c:\\temp"; 也可以在换行之前加上反斜杠以转义换行。这样反斜杠和换行都不会出现在字符串的值中。 js conststr="this string \ is broken \ across multiple \ lines.";console.log(str...
Learn about the Document interface, including its constructor, properties, and methods, specifications and browser compatibility.
console.log(ary2.next());//Object {value: Array[2], done: false} value:Array[2] ---[0:0,1:1]; console.log(ary2.next());//Object {value: Array[2], done: false} value:Array[2] ---[0:1,1:2]; //可以看出每次执行这个next().都会返回一个该数组的索引和值组成的新的数组,被...
附加参考页面 类 JavaScript 类。 constructor extends 私有属性 公有类字段 static 静态初始化块
()method is the wrong tool, use a plain loop instead. If you are testing the array elements for a predicate and need a Boolean return value, you can useevery()orsome()instead. If available, the new methodsfind()orfindIndex()can be used for early termination upon true predicates as ...
1.Array.from() 2.Array.isArray() 3.Array.of() 4.Array.prototype.concat() 5.Array.prototype.copyWithin() 6.Array.prototype.entries() 7.Array.prototype.every() 8.Array.prototype.fill() 9.Array.prototype.filter() 10.Array.prototype.find() 11.Array.prototype.findIndex() 12.Array.prototype...
Modern APIs represent list structures using types based on JavaScript arrays, thus making many array methods available, and at the same time imposing additional semantics on their usage (such as making their items read-only). Instance properties MimeTypeArray.length Deprecated The number of items ...
Theunshiftmethod inserts the given values to the beginning of an array-like object. unshiftis intentionally generic; this method can becalledorappliedto objects resembling arrays. Objects which do not contain alengthproperty reflecting the last in a series of consecutive, zero-based numerical properti...
浏览器兼容性 wordsmodifiedWordswordsarrindexwordlengthconsolemodifiedWordswordsappendedWordswordsarrwordlengthconsoleappendedWordswordsdeleteWordswordsarrwordlengthconsole.log(deleteWords);// 注意我们没有得到 'elite',因为它在过滤器访问到它之前就已经从 'words' 弹出了// ["spray" ,"limit"]...