Given a string, find the length of the longest substring without repeating characters. Examples: Given"abcabcbb", the answer is"abc", which the length is 3. Given"bbbbb", the answer is"b", with the length of 1. Given"pwwkew", the answer is"wke", with the length of 3. Note that...
常规定义的字符串是原始值,而使用new String创建的字符串是对象型 var m="abc"; var m1=new String(m); console.log(m==m1);//true console.log(m === m1);//false m为string,m1为object 1. 2. 3. 4. (5)检测类型,返回值是true/flase console.log(m1 instanceof String); //true 1. 2.Ar...
javascript // 1.长字符串 // 1.1 let longString1 = "This is a very long string which needs " + "to wrap across multiple lines because "
strObj.indexOf(subString[, startIndex]) 参数 strObj 必选项。String 对象或文字。 subString 必选项。要在 String 对象中查找的子字符串。 starIndex 可选项。该整数值指出在 String 对象内开始查找的索引。如果省略,则从字符串的开始处查找。 说明 indexOf 方法返回一个整数值,指出 String 对象内子字符串的开...
在第4 行,开始在mainString上循环。 在第5 行,在subString上开始嵌套循环。 在第6 行,如果没有找到匹配项,则中断内循环,并继续进行外循环的下一次迭代。 在第7 行,在内循环的最后一次迭代中返回true。 朴素搜索的时间复杂度 循环中有循环(嵌套循环)。两个循环都运行 n 次。因此,朴素搜索算法的时间复杂度是...
substr() Returns a part of a string by taking the starting position and length of the substring. substring() Returns a part of the string from the specified start index (inclusive) to the end index (exclusive). slice() Returns a part of the string from the specified start index (inclusiv...
process.uptime() // Return Node's uptime in seconds. process.version // Node's version string. process.versions // Version strings for the libraries Node depends on. “os”模块(与process不同,需要使用require()显式加载)提供了关于 Node 运行的计算机和操作系统的类似低级细节的访问。你可能永远不...
JavaScript String substr() ❮ Previous JavaScript String Reference Next ❯ Examples Extract a substring from text: let text = "Hello world!"; let result = text.substr(1, 4); Try it Yourself » Start at position 2: let result = text.substr(2); Try it Yourself » More ...
如果第二参数没有传，则默认从第一个参数指定的位置开始，截取后面所有的字符。letdemoString='hello ...
// from 9th to last element to 2nd to last element console.log(str.slice(-9, -1)); // 'language' Run Code Output language. language Also Read: Javascript String substring() JavaScript Array slice()Share on: Did you find this article helpful?Our...