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in Technique[技术] by (71.8m points)

vue watch一个对象,同个值触发了2次,为什么

A
<A :params={keyword:''}></A>

B

prop: {
    params: Object
}

watch: {
        params: {
            immediate: true,
            deep: true,
            handler (new, old) {
                
                // 触发1次 new:{keyword:''} old: undefine
                // 触发2次 new:{keyword:''} old: {keyword:''}
            }
        },
}

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by (71.8m points)

image.png
你使用了immediate属性,将立即以表达式的当前值触发回调。
第二次则是对象的地址指针变了


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