Regarding how to implement secondary linkage in Vue, the first value is selected by default

Below I will share with you an example of vue select second-level linkage selecting the first option value by default at the second level. It has a good reference value and I hope it will be helpful to everyone.

When the secondary linkage is, for example, selecting a country, if you want to select a country, the subsequent city will select the first city by default, then just add a @change event to the country's select

 所在区域   {{item.country}}      {{item}}    

data countryName:{}, cityName:"请选择城市", area:[ { "country":"美国", "city":[ "纽约", "洛杉矶", "旧金山", "西雅图", "波士顿", "休斯顿", "圣地亚哥", "芝加哥", "其它", ] }, { "country":"加拿大", "city":[ "温哥华", "多伦多", "蒙特利尔", "其它" ] }, { "country":"澳大利亚", "city":[ "悉尼", "墨尔本", "其它" ] }, { "country":"新加坡", "city":[ "新加坡" ] }, /*{ "country":"中国", "city":[ "北京市", ] },*/ ],

methods:

selectCountry(value){ this.cityName=this.countryName.city[0]; },

The above is what I compiled for everyone. I hope it will be helpful to everyone in the future.

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