【timeisprecious】【JavaScript 】JavaScript对象

JavaScript 对象

var a=[];console.log(new Boolean(a));
VM1319: Boolean {true}
undefined
var a=[];console.log(new Boolean(!!a));
VM1334: Boolean {true}
undefined
var a=null;console.log(new Boolean(!!a));
VM1337: Boolean {false}
undefined
var a=undefined;console.log(new Boolean(!!a));
VM1340: Boolean {false}
undefined
var a='';console.log(new Boolean(!!a));
VM1341: Boolean {false}
undefined
var a='  ';console.log(new Boolean(!!a));
VM1342: Boolean {true}
undefined
var a='  ';console.log(new Boolean(a));
VM1355: Boolean {true}
undefined
var a='  ';if(a){console.log()}
VM1376:
undefined