A页面:
window.localStorage.setItem('a',false)
window.addEventListener('storage',(e)=>{
if(e.key==='a'){
//dosomething
}
})
B页面：window.localStorage.setItem('a',true)
B页面修改localStorage的值触发A页面的事件
sessionStorage：窗口关闭自动清除，大小5MB左右。
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本文标题：localStorage、sessionStorage
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