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whitev2  css 对象 class 对象可以抽出来,放到别的位置.
<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Page Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" type="text/css" media="screen" href="main.css" />
    <script src="js/vue.js"></script>
</head>
<body>
    <div id="test" v-bind:style='[state.isSelect?styles.testSelect:styles.testNoSelect]' v-bind:class='[]'>
    </div>
    <script>
        var test = new Vue ({
            el:'#test',
            data:{
                state:{
                    isSelect:true
                },
                styles:{
                    testSelect:{
                        'width':'100px',
                        'height':'100px',
                        'background-color':'red'
                    },
                    testNoSelect:{
                        'width':'100px',
                        'height':'100px',
                        'background-color':'blue'
                    }
                },
                classes:{
                }
            }
            });
    </script>
</body>
</html>