js给一段话，遇到的第一个括号处加上换行符

list.forEach((item,index0)=>{
            const productName = item.name;
            const index = productName.indexOf('（');
            if (index == -1) {
             return productName;
            }
            const before = productName.slice(0, index);
            const after = productName.slice(index);
            item.name=before + '\n' + after;
          });