Search a string for the character "e": lettext ="The best things in life are free"; letresult =/e/.exec(text); Try it Yourself » Description The exec() method tests for a match in a string. If it finds a matc
Search a string for the character "e": lettext ="The best things in life are free";letpattern =/e/; letresult = pattern.test(text); Try it Yourself » Description The test() method tests for a match in a string. If it finds a match, it returns true, otherwise it returns false...
stringArray = concatString.split(" "); for (var i=0; i alert(stringArray[i]; } alert(newString.toUpperCase()); alert(newString.toLowerCase()); } 下面是执行上面的代码得到的结果: Tony Patton Character Found! The last index of n is: 10 Match found: Tony Please salute General Patton ...
var myString = "Have a nice day!"; var index = myString.indexOf("a"); while (index != -1) { alert(index); index = myString.indexOf("a", index + 1); // start search after last match found } 1. 2. 3. 4. 5. 6. 7. 详细解释一下这段代码:变量index被初始化为第一个"a...
1. String.fromCharCode() 该方法的参数是一系列Unicode码点,返回对应的字符串。 2. charAt() 该方法返回指定位置的字符,参数是从0开始编号的位置。 3. charCodeAt()方法返回给定位置字符的Unicode码点(十进制表示),相当于String.fromCharCode()的逆操作。
export const isEmojiCharacter = (value) => { value = String(value); for (let i = 0; i < value.length; i++) { const hs = value.charCodeAt(i); if (0xd800 <= hs && hs <= 0xdbff) { if (value.length > 1) { const ls = value.charCodeAt(i + 1); const uc = ((hs - ...
function (name) { let sex; const pet = { // 在这个上下文中:setName(newName) 等价于 setName: function (newName) setName(newName) { name = newName; }, getName() { return name; }, getSex() { return sex; }, setSex(newSex) { if ( typeof newSex === "string" && (newSex...
`the newline character at the end of this line is included literally in this string` 请注意,当使用单引号界定字符串时,必须小心处理英语缩写和所有格,例如can’t和O’Reilly’s。由于撇号与单引号字符相同,必须使用反斜杠字符(\)来“转义”出现在单引号字符串中的任何撇号(转义在下一节中有解释)。
String indexes refer to using numerical characters to obtain a single character in a string. For example, in the string “abc”, you can refer to the letter a by using a string index of zero (e.g. “abc”[0]). Making a number from a string is pretty easy in JavaScript. You need...
The search() method searches for a match between a given string and a regular expression. Example let sentence= "I love JavaScript."; // pattern that searches the first occurence of an uppercase character let regExp = /[A-Z]/; // searching for a match between regExp and given ...