我想问下这种该如何用if判断，用console.log(this.data.path==null)是false
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把thin.data.path赋值给一个变量，直接if(变量)就可以了
if (!this.data.path) { // null、undefined、false、数字0时成立 console.log("值不合理"); )=== 会判断是否完全相等 val===""?true:false