tooltips: {
show: true,
trigger: "item",
axisPointer: {
type: "shadow"
}
}, 
according to the above settings in the document, there will be a gray floating box in the picture after the mouse.
but in my project, the same setting is not successful, and it is not even possible to copy the instance code into it.
is there other additional settings before the floating box will take effect?
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