let str1 = "Hello"; let str2 = "hello"; if (str1.toLowerCase() === str2.toLowerCase()) { console.log("Strings are equal, ignoring case."); } else { console.log("Strings are not equal."); } 方法二:使用正则表达式 你也可以使用正则表达式来创建一个不区分大小写的比较函数。 代码...
代码语言:txt 复制 let str1 = "Hello"; let str2 = "Hello"; let str3 = new String("Hello"); // 使用严格相等运算符 console.log(str1 === str2); // 输出: true console.log(str1 === str3); // 输出: false,因为str3是一个String对象,而不是原始字符串 // 使用抽象相等运算...
assert.equal() 可用于测试相等性。assert.notStrictEqual() 可用于测试严格不等式。例子最简单的断言示例:QUnit.test('good example', assert => { const result = '2'; // succeeds, 1 and 2 are different. assert.notEqual(result, 1, 'string and number'); }); QUnit.test('bad example', ...
可以使用String作为toString()更可靠的代替方法,因为它在用于null和undefined时仍然有效。例如: js constnullVar=null;nullVar.toString();// TypeError: nullVar is nullString(nullVar);// "null"constundefinedVar=undefined;undefinedVar.toString();// TypeError: undefinedVar is undefinedString(undefinedVar);/...
== 0 || 1 / x === 1 / y; } else { // return true if both x AND y evaluate to NaN. // The only possibility for a variable to not be strictly equal to itself // is when that variable evaluates to NaN (example: Number.NaN, 0/0, NaN). // This checks for...
earlier than or equal to secondDate)console.log(firstDate<=secondDate)// true (firstDate is later than or equal to secondDate)console.log(firstDate==secondDate)// false (firstDate is not equal to secondDate)console.log(firstDate!=secondDate)// true (firstDate is not to equal secondDate...
equal [ˈikwəl] 相等的 注意: (=>) 不是运算符,而是箭头函数的标记符号 。 全等和等于的区别: ² 全等“===”运算符比较过程: 只有两个值类型相同并且值也相同的时候,它们才相等。 如果两个引用值指向同一个对象、数组或函数,则它们是相等的。如果指向不同的对象,则它们是不等的,尽管两个对象具有...
/** Not localized full time format string @example "23:44" */ fullTime24h: TLibFormatToken; /** Date & time format string with localized time @example "Jan 1, 2018 11:44 PM" */ fullDateTime: TLibFormatToken; /** Not localized date & Time format 12h @example "Jan 1, 2018 11:...
than or equal to secondDate)console.log(firstDate <= secondDate)// true (firstDate is later than or equal to secondDate)console.log(firstDate == secondDate)// false (firstDate is not equal to secondDate)console.log(firstDate != secondDate)// true (firstDate is not to equal second...
!=not equal !==not equal value or not equal type >greater than <less than >=greater than or equal to <=less than or equal to ?ternary operator Note Comparison operators are fully described in theJS Comparisonschapter. JavaScript String Comparison ...