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24 lis 2009 · In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found: var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1); // true
document.location is an object, not a string. It returns (by default) the full path, but it actually holds more info than that. Shortcut for solution: document.location.toString().substring(2,3); Or use document.location.href or window.location.href
The substring() method extracts characters from start to end (exclusive). The substring() method does not change the original string. If start is greater than end, arguments are swapped: (4, 1) = (1, 4). Start or end values less than 0, are treated as 0.
4 cze 2024 · substring() extracts characters from indexStart up to but not including indexEnd. In particular: If indexEnd is omitted, substring() extracts characters to the end of the string. If indexStart is equal to indexEnd, substring() returns an empty string.
12 wrz 2023 · A string's substr() method extracts length characters from the string, counting from the start index. If start >= str.length, an empty string is returned. If start < 0, the index starts counting from the end of the string. More formally, in this case the substring starts at max(start + str.length, 0). If start is omitted or undefined, it's ...
25 lip 2024 · String.prototype.substr() Deprecated. Returns a portion of the string, starting at the specified index and extending for a given number of characters afterwards. String.prototype.substring() Returns a new string containing characters of the calling string from (or between) the specified index (or indices). String.prototype.toLocaleLowerCase()
7 paź 2022 · To do a case-insensitive check and see if a substring is present within a string, you will need to convert both the original string and the substring to lowercase using the toLowerCase() JavaScript method before calling one of the two methods.
