js 三种for
var books=[
{tittle:'xiao'},
{tittle:'dd',price:12}
]
for(book of books){}
for(book in books){}
for (let i=0;i<books.length;i++){
books[i] ...
...
}
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var books=[
{tittle:'xiao'},
{tittle:'dd',price:12}
]
for(book of books){}
for(book in books){}
for (let i=0;i<books.length;i++){
books[i] ...
...
}
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