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[vue] 怎么在watch监听开始之后立即被调用？ #266

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haizhilin2013 opened this issue Jun 16, 2019 · 4 comments
Open

[vue] 怎么在watch监听开始之后立即被调用？ #266

haizhilin2013 opened this issue Jun 16, 2019 · 4 comments
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@haizhilin2013
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[vue] 怎么在watch监听开始之后立即被调用？
@haizhilin2013 haizhilin2013 added the vue vue label Jun 16, 2019
@wenyejie
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有个参数immediate
https://cn.vuejs.org/v2/api/#vm-watch

@lancelote-zpc
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  let vm=new Vue({
        el:"#first",
        data:{msg:'liuneng'},
        watch:{

            msg:{
                handler (newMsg,oldMsg){
                    console.log(newMsg);
                },
                immediate:true
            }
        }
    })

设置immediate属性为true

@crush2020
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选项：immediate

在选项参数中指定 immediate: true 将立即以表达式的当前值触发回调

@yxllovewq
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直接添加watch.监听对象.immediate = true就ok

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@wenyejie @haizhilin2013 @lancelote-zpc @crush2020 @yxllovewq