look at this

is it difficult for Baidu to take a look?

cause of the problem:
1. V-show controls the hiding and display attributes of elements, namely: display:none | block; For static elements and data that do not need to be re-rendered
2. V-if renders only when it is needed. This element does not exist in the page before rendering, and the various attributes of the corresponding element
3 and < section id= "myChart" > < / section > are also covered with a layer of div,. The div is controlled by v-if, so the echarts blank is displayed

Summary: situations that cause echarts to hide and display switch div blanks:
1, such as: "uneven" links, that is, caused by highly incorrect acquisition;
2, not echarts bound v-if not re-rendered;
3, that is, in my case, caused by careless nesting of v-if and v-show;