js全等运算符和相等运算符输出的结果有什么不同

js全等运算符和相等运算符输出的结果有什么不同，下面web建站小编给大家介绍运行结果。

代码示例：

console.log('2 == 2: ' + (2 == 2)); //true
console.log('2 === 2: ' + (2 === 2)); //true

console.log('2 == "2": ' + (2 == "2")); //true
console.log('2 === "2": ' + (2 === "2")); //false

console.log('true == 1: ' + (true == 1)); //true
console.log('true === 1: ' + (true === 1)); //false

console.log('false == 0: ' + (false == 0)); //true
console.log('false === 0: ' + (false === 0)); //false

console.log('"" == 0: ' + ("" == 0)); //true
console.log('"    " == 0: ' + ("    " == 0)); //true
console.log('null == undefined: ' + (null == undefined)); //true
console.log('null == 0: ' + (null == 0)); //false
console.log('undefined == "": ' + (undefined == "")); //false

console.log('"false" == false: ' + ("false" == false)); //false
console.log('NaN == NaN: ' + (NaN == NaN)); //false
console.log('NaN == false: ' + (NaN == false)); //false
console.log('NaN === false: ' + (NaN === false)); //false