alert(str2.includes('fox', 4)); // output: true // 示例3：结合模板字符串使用 let str3 = 'JavaScript';if (str3.includes('Script')) { alert(`The string "${str3}" contains "Script".`);} else { alert(`The string "${str3}" does not contain "Script".`);} 五、注意事项 1、...
If the string does not contain the substring then it will return null. We will take an example to understand it. var actualstring = "Javascript match method", var substringToCheck = "match"; actualstring.match("match"); //["match", index: 11, input: "Javascript match method", ...
If you want to find if a string contains another string then you already have a ready made function for that, and it would bestring.includes(). This function returnstruewhen the method finds another substring included in the main one, and returnsfalsewhen the main string does not contain th...
Therefore, if the return value is not -1, we can safely assume that the string does contain the substring we are looking for. Note that you can also use this method to search for a single character. Why not use the includes() method? You can also use theString.prototype.includes()meth...
@param {string|string[]=} locales A locale string or array of locale strings that contain one ...
随着let和const这两个关键字的添加,JS增加了块级作用域的概念。 如何在JavaScript中使用let 当我们在用let声明变量时,用于声明一次之后就不能再以相同的名称重新声明它。 代码语言:javascript 代码运行次数:0 运行 AI代码解释 // ES5 Codevarvalue=10;console.log(value);// 10varvalue="hello";console.log(valu...
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....
Evaluate the stringstras a script (global eval). loadScript(filename) Evaluate the filefilenameas a script (global eval). Error(errno) std.Errorconstructor. Error instances contain the fielderrno(error code) andmessage(result ofstd.Error.strerror(errno)). ...
If the separator is omitted, the returned array will contain the whole string in index [0]. If the separator is "", the returned array will be an array of single characters: Example text.split("") Try it Yourself » Complete String Reference ...
placement string | function 'top' How to position the tooltip - top | bottom | left | right | auto.When "auto" is specified, it will dynamically reorient the tooltip. For example, if placement is "auto left", the tooltip will display to the left when possible, otherwise it will display...