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html code:

<prop-ver :prop-a="num" :prop-b="num2"></prop-ver>

js code:

var propVer={
    prop:{
        propA:{
            type:Number,
            default:100
        },
        propB:{
            type:Number,
            default:100
        }
    },
    tempalte:'<p>{{propA}}------{{propB}}</p>'
};
new Vue({
    el:'#el',
    data:{
        num:'222',
        num2:222
    },
    components:{
        'prop-ver':propVer
    }
});

The code is as above. "I feel that default is useless and has no prompts or effects.
Solved: I originally thought that the value passed in did not meet the type requirements, and then the default value was used. It turns out to be the default value when there is no value