TypeError:传入属性时无法读取属性

var obj = null;
console.log(obj.property); // TypeError: Cannot read property 'property' of null

var num = 10;
console.log(num.property); // TypeError: Cannot read property 'property' of number

var obj = null;
if (obj !== null && obj !== undefined) {
  console.log(obj.property);
}

// 或者使用可选链运算符
console.log(obj?.property);

var num = 10;
if (typeof num === 'object') {
  console.log(num.property);
}

// 或者将数字转换为对象
var numObj = new Number(num);
console.log(numObj.property);