===与==有什么去呗
[*][10] === 10 // is false
[*][10] == 10 // is true
[*]'10' == 10 // is true
[*]'10' === 10 // is false
[*] [] == 0 // is true
[*] [] === 0 // is false
[*] '' == false // is true but true == "a" is false
[*] '' === false // is false
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