官网上这样说：
QQ截图20180919095544.png
经测试，disabled无效的情况（按钮可点击）为 null、undefined、false，空字符串是生效的，在开发时需要注意。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>vue button disabled</title>
<script src="https://cdn.jsdelivr.net/npm/vue@2.5.17/dist/vue.js"></script>
</head>
<body>
<div id="app">
<button class="btn" :disabled="isButtonDisabled">hello</button>
<button class="btn" @click="isButtonDisabled = false">flase</button>
<button class="btn" @click="isButtonDisabled = null">null</button>
<button class="btn" @click="isButtonDisabled = undefined">undefined</button>
<button class="btn" @click="isButtonDisabled = true">true</button>
<button class="btn" @click="isButtonDisabled = '123'">非空字符串</button>
<button class="btn" @click="isButtonDisabled = ''">空字符串</button>
<button class="btn" @click="isButtonDisabled = 0">数字0</button>
<button class="btn" @click="isButtonDisabled = []">空数组</button>
<button class="btn" @click="isButtonDisabled = {}">空数组</button>
</div>
<script>
var vm = new Vue({
el: '#app',
data: {
isButtonDisabled: false,
}
})
</script>
</body>
</html>
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