First of all, we can see that there are some categories of goods on the left of JD.COM. Home page of COM. In these categories, we find the column of mobile phone/operator/digital, and then put the mouse cursor on this column, right, not clicking. At this time, some detailed categories will appear on the right. There is a trade-in option in the upper right corner of these categories. We click this option. After entering this option, we can see the classification of recycled items in the upper left corner, and there is a search box on the right side of the classification. There are also some categories under the search box. We can choose the classification according to our idle items, and then choose the model of our idle items. We can also directly enter the model of our idle items in the search box to search, or we can open one of the following categories at will to choose the brand. After selecting the idle item we want to evaluate, we put the mouse on the position of this item. At this time, he will have an option to evaluate. We will click on the evaluation and then go to the evaluation page. In this page, we will select the current status of the items we want to evaluate according to the options provided by him, which should be consistent with the status of our idle items.