相等与比较

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"" == "0" // false
0 == "" // true
0 == "0" // true
false == "false" // false
false == "0" // true
false == undefined // false
false == null // false
null == undefined // true
" \t\r\n" == 0 // true
  • 0 is false
  • “” is false
  • undefined is false
  • null is false