Traversing array objects in vue, judging according to conditions, and then deleting objects, error, why?

problem description

the environmental background of the problems and what methods you have tried

before, i=i-1 was not written in if. After the second cycle, the deletion prompt will break and stop running.
after writing the i=i-1, you can continue to run

.

related codes

/ / Please paste the code text below (do not replace the code with pictures) 

          var p=this.propertylistIn.length
                var pt = this.propertylistIn
                
                for (var i =0 ; i<p;iPP){

                    if(pt[i].pkPropertyOwnerId==w){
                        pt.splice(i,1)
                        i=i-1
                       
                    }
                }
                this.propertylistIn=pt

clipboard.png

what result do you expect? What is the error message actually seen?

how to solve this error

Vue-cli javascript
Jun.10,2021

if you want to take out every item in the array where the attribute pkPropertyOwnerId is not equal to w, you should return a new array with filter instead of repeatedly manipulating the current array. 

var pt = this.propertylistIn;
// newPt
var newPt = pt.filter(function (item) {
    return item.pkPropertyOwnerId !== w;
})

related documents: http://www.runoob.com/jsref/j.

this error means that pt [I] does not have pkPropertyOwnerId attribute

should be p = pkPropertyOwnerId==w 1, but if you do this, you will not be able to delete the adjacent pkPropertyOwnerId==w. You can use pt [I] .pkPropertyOwnerId! = w push new Array

.

splice will change the length of the original array, so it will appear that PT [I] is undefined, you can use filter, or this: 

for (var i =0 ; i<this.propertylistIn.length;iPP){
    if(pt[i].pkPropertyOwnerId==w){
        pt.splice(i,1)
        i=i-1
    }
}

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