2. 内容过滤:在处理文本内容时,检测是否包含敏感词、非法字符或特定关键词,以进行内容审核、自动标记或过滤。 function containsProfanity(text) { const profanities = ["swearword1", "swearword2", "etc."]; return profanities.some(word => text.includes(word)); } const message = "This message contai...
string.includes(searchValue[, fromIndex]) searchValue: 必需,要查找的子字符串。 fromIndex: 可选,整数,表示开始查找的位置。默认值为 0,即从字符串的起始位置开始查找。 该方法返回一个布尔值: true: 如果 searchValue 存在于原字符串中。 false: 如果 searchValue 不存在于原字符串中。 使用场景 1. 用户...
Thebtoa()method creates a Base64-encoded ASCII string from a binary string (i.e., a string in which each character in the string is treated as a byte of binary data). 现在您知道JavaScript中的字符通常需要不止一个字节,下一部分将演示如何处理这种情况下的base64编码和解码。 btoa()和atob()与...
A string can be any text inside double or single quotes: letcarName1 ="Volvo XC60"; letcarName2 ='Volvo XC60'; Try it Yourself » String indexes are zero-based: The first character is in position 0, the second in 1, and so on. ...
string – 如果变量是 String 类型的 object – 如果变量是一种引用类型或 Null 类型的 3)通过instanceof 运算符解决引用类型判断问题 4)null 被认为是对象的占位符,typeof运算符对于null值返回“object”。 5)原始数据类型和引用数据类型变量在内存中的存放如下: ...
JavaScript String charAt() ThecharAt()method returns the character at a specified index (position) in a string: Example lettext ="HELLO WORLD"; letchar= text.charAt(0); Try it Yourself » JavaScript String charCodeAt() ThecharCodeAt()method returns the code of the character at a specified...
The value of the number usually depends on whether the result is true or false or whether the resultant string contains a number. To understand this better, consider the following examples: alert(true+true)//2 alert(true+false)//1 alert(false+false)//0 Each code sample is a Boolean ...
文章目录 一、根据索引位置返回字符串中的字符 1、charAt 函数获取字符 2、charCodeAt 函数获取字符 ASCII 码 3、数组下标获取字符 String 字符串对象参考文档 : https...://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/String 一、根据索引位置返回字符串中的字符...根据索引位置返回...
The following provides a means of ensuring that going through a string loop always provides a whole character, even if the string contains characters that are not in the Basic Multi-lingual Plane. var str = 'A \uD87E\uDC04 Z'; // We could also use a non-BMP character directly for (...
range.selectNode(document.getElementsByTagName("div").item(0));constdocumentFragment = range.createContextualFragment(tagString);document.body.appendChild(documentFragment); 3.7. deleteContents() deleteContents():删除框选的内容。 constrange =document.createRange(); ...