错误: stContent = formerSt ? formerSt : obj.value;
正确: stContent = formerSt || obj.value; // 若formerSt没值则将obj.value赋给它,若有值则是formerSt本身
错误: stContent = formerSt ? formerSt : obj.value;
正确: stContent = formerSt || obj.value; // 若formerSt没值则将obj.value赋给它,若有值则是formerSt本身