Or we can use third-party libraries like lodash js and underscore js to check if a string contains a substring or not in javascript. These libraries contain so many javascript utility methods that can be used in our daily projects.
log(`String does not contain "${substr}"`) } // String contains "React" The String.includes() method takes two parameters: searchString— The substring to search for within this string. position— The index to start the search from. This parameter is optional. If not specified, the ...
Pre-ES6, the common way to check if a string contains a substring was to use indexOf, which is a string method that return -1 if the string does not contain the substring. If the substring is found, it returns the index of the character that starts the string....
The String.indexOf() method returns the index of the first occurrence of the substring. If the string does not contain the given substring, it returns -1. The indexOf() method is case-sensitive and accepts two parameters. The first parameter is the substring to search for, and the second...
The first string contains at least one letter whereas the next two don't. TheString.match()method returns an array of the matches for the first string andnullvalues for the next two. If you ever need help reading a regular expression, check out thisregular expression cheat sheetby MDN. ...
天看了老东家的一个专题页面,发现里边的checkFrome.js收集了很多对文本框的判断,非常有用收藏一下。 其中包含了: 1、页面截取字符串 2、文本框最大长度限制 3、判断必须是数字和字母的组合 4、判断是否有中文 5、判断是否有sql非法字符 6、判断是否有特殊字符 ...
Never just use JavaScript template strings or string concatenation to inject values into queries as this opens your application to a wide spectrum of vulnerabilities. All the reputable Node.js data access libraries (e.g. Sequelize, Knex, mongoose) have built-in protection against injection attacks....
Never just use JavaScript template strings or string concatenation to inject values into queries as this opens your application to a wide spectrum of vulnerabilities. All the reputable Node.js data access libraries (e.g. Sequelize, Knex, mongoose) have built-in protection against injection attacks....
If the Array.indexOf() method returns a value other than -1, the arrays contain common elements. index.jsconst arr1 = ['pizza', 'cake', 'cola']; const arr2 = ['pizza', 'beer']; const contains = arr1.some(element => { return arr2.indexOf(element) !== -1; }); console.lo...
string *returns:stringafterremovingleftandrightspaces */ Functiontrim(STR){ Return(lTrim(rTrim(STR)); } /** *function:displaypromptinformationbasedonerrornumber *parameter:(1)errNo:errornumber(correspondingto message.jsfile);(2)objName:objectname(optional parameter) *returns:alertdialogbox */ ...