Vue.js watch 监听器优化：防止初始值改变总分

watch(() => planModel.eatScore, (newVal, oldVal) => {\n if (newVal !== oldVal) {\n planModel.totalScore += newVal - oldVal;\n }\n});\n\nwatch(() => planModel.washScore, (newVal, oldVal) => {\n if (newVal !== oldVal) {\n planModel.totalScore += newVal - oldVal;\n }\n});\n\nwatch(() => planModel.wearScore, (newVal, oldVal) => {\n if (newVal !== oldVal) {\n planModel.totalScore += newVal - oldVal;\n }\n});\n\nwatch(() => planModel.toiletScore, (newVal, oldVal) => {\n if (newVal !== oldVal) {\n planModel.totalScore += newVal - oldVal;\n }\n});\n\nwatch(() => planModel.moveScore, (newVal, oldVal) => {\n if (newVal !== oldVal) {\n planModel.totalScore += newVal - oldVal;\n }\n});