flex布局
当 flex 取值为一个非负数字,则该数字为 flex-grow 值,flex-shrink 取 1,flex-basis 取 0%,如下是等同的:
.item {flex: 1;}
.item {
flex-grow: 1;
flex-shrink: 1;
flex-basis: 0%;
}
当 flex 取值为 auto,则计算值为 1 1 auto,如下是等同的:
.item {flex: auto;}
.item {
flex-grow: 1;
flex-shrink: 1;
flex-basis: auto;
}
当 flex 取值为 none,则计算值为 0 0 auto,如下是等同的:
.item {flex: none;}
.item {
flex-grow: 0;
flex-shrink: 0;
flex-basis: auto;
}

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