This "simpler" version gives incorrect results if there are two copies of the needle in the string -- then lastIndexOf returns the position of the last copy of that needle, which will be greater than zero, and so will always return False, whether or not the string actually does startWit...
1 if (typeof String.prototype.endsWith != 'function') { 2 String.prototype.endsWith = function(suffix) { 3 return this.indexOf(suffix, this.length - suffix.length) !== -1; 4 }; 5 } 和startsWith不一样,endsWith中可以使用indexOf。原因是它只扫描了最后的一段字符串,而比起slice的优势...
1821 How to check if a string "StartsWith" another string? 0 JQuery if input starts with a value Related 1821 How to check if a string "StartsWith" another string? 1 How can I check if the contents of a variable start with something? 0 How can I make javascript match the start of...
Returns true if the string starts with the value, otherwise it returns false JavaScript Version: ECMAScript 6More ExamplesCheck if a string starts with "world", starting the search at position 6: var str = "Hello world, welcome to the universe."; var n = str.startsWith("world", 6); ...
startsWith()is not supported in Internet Explorer. JavaScript String endsWith() TheendsWith()method returnstrueif a string ends with a specified value. Otherwise it returnsfalse: Examples Check if a string ends with "Doe": lettext ="John Doe"; ...
If you ever need to check if a string begins with another string in JavaScript, use ES6's startsWith method...
The startsWith() method returns true if a string begins with specified character(s). If not, it returns false. Example const message = "JavaScript is fun"; // check if message starts with Java let result = message.startsWith("Java"); console.log(result); // true // check if ...
In this post, we will see how to check whether the first character in a string is a space or not using Javascript. To check if a string starts with a space or not we can use: RegExptestmethod, Stringmatchmethod with regExp, or ...
Example 1: Using endsWith() Method // string definitionletsentence ="JavaScript is fun"; // checking if the given string ends with "fun"letcheck = sentence.endsWith("fun"); console.log(check); // checking if the given string ends with "is"letcheck1 = sentence.endsWith("is"); ...
text.startsWith("Hello",1); Try it Yourself » Description ThestartsWith()method returnstrueif a string starts with a specified string. Otherwise it returnsfalse. ThestartsWith()method is case sensitive. See Also: The endsWith() Method ...