下面的三元判断的代码表示什么意思？
document.all.clothes.style.display=document.all.shoes.style.display=='none'?'':'none'"> <style="display:' '" id="clothes">
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document.all.shoes.style.display=document.all.shoes.style.display=='none'?'':'none'">
<style="display:none" id="shoes">
