//console.log(typeof(obj.cond)) //object
let data = JSON.stringify(obj) //引用传递和非引用传递
data = JSON.parse(data)
delete data.formData
//console.log(typeof(data.cond)) string!!
if (data.cond == '{}'){
delete data.cond
}
JSON.parse
和JSON.stringify
并不一定是互逆运算
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