除上述规则外,equal( ==) 和 not-equal( !=) 运算符还具有以下规则。 比较null和undefined 在JavaScript 中,null等于undefined, 这意味着以下表达式返回true。 console.log(null==undefined);// true NaN与其他值的比较 如果任一操作数是N...
三元运算符 Ternary Operator 条件运算符( conditional operator,)(也称为三元运算符( ternary operator))语法是:a ? b : c, wherea是条件,当条件返回true的时候运行代码b,当条件返回false的时候运行代码c。 functioncheckEqual(a, b) {returna === b ?"Equal":"Not Equal"; } 确定类型 Typeof 使用type...
OperatorDescription ==equal to ===equal value and equal type !=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. ...
OperatorComparisonsDescription Equal (==) x == y Returns true if the operands are equal. Strict equal (===) x === y Returns true if the operands are equal and of the same type. Not equal (!=) x != y Returns true if the operands are not equal....
10) 关系运算符(Relational operator [rɪ'leɪʃənl]) 1. 赋值运算符(Assignment operators) 一个赋值运算符将它右边操作数的值赋给它左边的操作数。 最简单的赋值运算符是等于(=),它将右边的操作数值赋给左边的操作数。那么 x = y 就是将 y 的值赋给 x。
=== Strictly equal to 3 === "3" gives us false !== Strictly not equal to 3 !== "3" gives us true Example 3: Comparison Operators in JavaScript // equal to operator console.log("Equal to: 2 == 2 is", 2 == 2); // not equal operator console.log("Not equal to: 3 != ...
1. JavaScript Equal To OperatorThe equal to operator == evaluates totrue if the values of the operands are equal. false if the values of the operands are not equal.For example,// same value, same type console.log(5 == 5); // true // same value, different type console.log(2 == ...
== 被称为 Equals Operator （注意看没有 Strict 了），假设有表达式a == b，则它的实际运算过程...
index // => 1: not incremented because ?.[] short-circuits a[index++] // !TypeError: can't index undefined. 使用?.和?.[]进行条件属性访问是 JavaScript 的最新功能之一。截至 2020 年初,这种新语法在大多数主要浏览器的当前或测试版本中得到支持。
createTextNode('a is not equal to b [ != operator ]'); //creates text along with ouput to be displayed newParagraph1.appendChild(newText1); //created text is appended to the paragraph element created document.body.appendChild(newParagraph1); // created paragraph and text along with ...