var obj = {
flag: true
}
var test = !!obg.flag
等同于
var test =obj.flag || false
var a = res.data
if (!!a) {
console.log(1)
}
等同于
if (a !== null || typeof a !== 'undefined' || a !==0 || a !== '') {
console.log(1)
}
微信扫一扫
var obj = {
flag: true
}
var test = !!obg.flag
等同于
var test =obj.flag || false
var a = res.data
if (!!a) {
console.log(1)
}
等同于
if (a !== null || typeof a !== 'undefined' || a !==0 || a !== '') {
console.log(1)
}
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