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<script>    
    var one = {
        template: "<h4>123456</h4>"
    };
    var app = new Vue({
        el: '#app',
        components: {
            "one": one
        },
        data: function() {
            return {
                msg: 123
            }
        },
        template: "<one></one>"
    })
</script>

调式源码,image.png

Vue.extend这个是在哪里调用的,一直没找到


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当你Vue.component('xxx',xxx)通过这样方式创建vue组件的时候会调用vue.extend。 源码调用位置如下图所示。
image.png


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