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VUE指令-样式绑定v-bind

样式绑定v-bind

操作元素的 class列表和内联样式是数据绑定的一个常见需求。因为它们都是属性,所以我们可以用 

v-bind

 处理它们:只需要通过表达式计算出字符串结果即可。不过,字符串拼接麻烦且易错。因此,在将 

v-bind

 用于 

class

 和 

style

 时,Vue.js做了专门的增强。表达式结果的类型除了字符串之外,还可以是对象或数组。

v-bind:style

<!-- 格式v-bind:style="{ key:value }" -->

<!-- 格式v-bind:style="[dataStyle0,dataStyle1]" -->

<!-- 样式属性不添加'',将缩写为java驼峰命名变量 'font-size' >>> fontSize -->

<div style="height: 180px;background: #CCC;margin: 5px;">

     <div style="font-size: 20px;">

         v1.v-bind:style="{ key:value }"</div>

     <hr />

     <div>

         <div v-bind:style="{ color:colorVar , fontSize:fontVar + 'px'}">

              Name

         </div>

         <div v-bind:style="[dataStyle0,dataStyle1]">

              Name

         </div>

     </div>

</div>

v-bind:class

<!-- 格式v-bind:class="{ clazzStyle , isBind }" -->

<!-- 格式v-bind:class="clazzObject" ,obj包含需要绑定的样式 -->

<!-- 格式v-bind:class="[clazz0,clazz1]" ,clazz定义在data的样式对象 -->

<div style="height: 150px;background: #CCC;margin: 5px;">

     <div style="font-size: 20px;">

         v0.v-bind指令示例(class)</div>

     <hr />

     <div>

         <div v-bind:class="{ style0 : isBind ,style1:true}">

              Name

         </div>

         <div v-bind:class="clazzObj">

              Name

         </div>

         <div v-bind:class="cssClazz">

              Name

         </div>

     </div>

</div>

<!DOCTYPE html>
<html style="height: 100%;">

	<head>
		<meta charset="UTF-8">
		<script type="text/javascript" src="../lib/vue.v2.5.12.js" ></script>
		<title>HelloDemo</title>
	</head>

	<body style="height: 100%;">
		<style>
			.style0{
				font-size: 25px;
				color: green;
			}
			.style1{
				background: gold;
			}			
		</style>
		<!-- 
			VUE指令v-bind样式绑定指令
				
			REF:
				http://www.runoob.com/vue2/vue-class-style.html
				https://cn.vuejs.org/v2/guide/class-and-style.html
		-->
		<div id="appVue">
			<!-- 格式v-bind:class="{ clazzStyle , boolean表达式 }" -->
			<div style="height: 200px;background: #CCC;margin: 5px;">
				<div style="font-size: 20px;">
					v0.v-bind条件渲染(value,key,index)</div>
				<hr />
				<div>
					<div v-bind:class="{style0: 5 > 1}">
						Name
					</div>
				</div>
			</div>

			<!-- 格式v-bind:style="{ key:value }" -->
			<!-- 格式v-bind:style="[dataStyle0,dataStyle1]" -->
			<!-- 样式属性不添加'',将缩写为java驼峰命名变量 'font-size' >>> fontSize -->
			<div style="height: 180px;background: #CCC;margin: 5px;">
				<div style="font-size: 20px;">
					v1.v-bind:style="{ key:value }"</div>
				<hr />
				<div>
					<div v-bind:style="{ color:colorVar , fontSize:fontVar + 'px'}">
						Name
					</div>
					<div v-bind:style="[dataStyle0,dataStyle1]">
						Name
					</div>								
				</div>
			</div>
			
			<!-- 格式v-bind:class="{ clazzStyle , isBind }" -->
			<!-- 格式v-bind:class="clazzObject" ,obj包含需要绑定的样式 -->
			<!-- 格式v-bind:class="[clazz0,clazz1]" ,clazz定义在data的样式对象 -->
			<div style="height: 150px;background: #CCC;margin: 5px;">
				<div style="font-size: 20px;">
					v0.v-bind指令示例(class)</div>
				<hr />
				<div>
					<div v-bind:class="{ style0 : isBind ,style1:true}">
						Name
					</div>
					<div v-bind:class="clazzObj">
						Name
					</div>	
					<div v-bind:class="cssClazz">
						Name
					</div>					
				</div>
			</div>			
		</div>
		<script>
			new Vue({
					el: "#appVue",
					data: {
						cssClazz:'style1',
						clazzObj:{
							'style0':true
						},
						colorVar:'green',
						fontVar:25,
						isBind:true,
						dataStyle0:{
							'color':'red',
							'font-size':'30px'
						},
						dataStyle1:{
							fontWeight:'bold'
						}
					}
				}

			)
		</script>
	</body>
</html>
           

REF:

http://www.runoob.com/vue2/vue-class-style.html

    https://cn.vuejs.org/v2/guide/class-and-style.html