一、类型转换

二、补充

javascript">console.log(1 +  "2" + "2"); // 122
console.log(1 +  +"2" + "2"); // 32
console.log(1 +  -"1" + "2"); // 02
console.log(+"1" +  "1" + "2"); // 112
console.log( "A" - "B" + "2"); // NaN2
console.log( "A" - "B" + 2); // NaN
console.log("10,11" == [[[[10]],11]]) // 10,11 == 10,11, 答案: true
console.log("[object Object]" == {name: "test"}) // true