but during this period we have changed our planet a lot in many ways是啥意思

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参考技术A 答案是:但是在这段时间,在许多方面我们把我们的行星改变了很多

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开发中遇到的bug-Property or method “xxxx“ is not defined on the instance but referenced during render.

method没加s加上就好了

<body>
    <div id="app">
        <button @click="sub">-</button>
        <span>code</span>
        <button @click="add">+</button>
    </div>
    <script>
        var app = new Vue(
            el: "#app",
            data: 
                code: 0
            ,
            methods: 
                add: function () 
                    if (this.code < 10) 
                        this.code++;
                     else 
                        alert('到头啦!不要再加啦');
                    
                ,
                sub: function () 
                    if (this.code > 0) 
                        this.code--;
                     else 
                        alert('到头啦!不要再减啦');
                    
                
            
        )
    </script>
</body>

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