flex can automatically wrap lines with two-sided alignment, because the data is returned, and I don"t know how many 
flex can automatically wrap lines with two-sided alignment, because the data is returned, and I don"t know how many
generally this case is filled with blank elements, with the remainder method, after the addition of a few blank elements.
for example, seven items of data are obtained, and there are four in a row. 4-7% 4 is the blank element you want to add
justify-content parent: display:flex; justify-content:flex-strat,flex=wrap:wrap; son: set width and height, margin will be fine. justify-content: space-around; justify-content:between; calc cooperate with flex to understand the layout scheme he said is filled with a line, so the two ends of the line are aligned to the left, so justify-content: space-around is not allowed at all, so this kind of layout generally requires the item to be wide, and then the container defines negative margin https://www.runoob.com/w3cnot. location is 3.3flex-flow Yes, add several placeholder elements
.
.container {
display: flex;
justify-content: space-between;
flex-wrap: wrap;
}
.item {
width: 20%;
}
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