v-text
v-for
v-html
指令: 扩展html语法
自定义指令:
1. 自定义属性指令:
Vue.directive(指令名称,function(参数){
this.el -> 原生DOM元素 // vm.$el
});
<div v-red="参数"></div>
指令名称: v-red -> red
* 注意: 必须以 v-开头（定义时去掉v-）
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>智能社——http://www.zhinengshe.com</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<style>
</style>
<script src="vue.js"></script>
<script>
Vue.directive(‘red‘,function(color){
this.el.style.background=color;
});
window.onload=function(){
var vm=new Vue({
el:‘#box‘,
data:{
a:‘blue‘
}
});
};
</script>
</head>
<body>
<div id="box">
<span v-red="a">
asdfasd
</span>
</div>
</body>
</html>
Vue.directive(‘red‘,function(color){})
demo：拖拽
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>智能社——http://www.zhinengshe.com</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<style>
</style>
<script src="vue.js"></script>
<script>
Vue.directive(‘drag‘,function(){
var oDiv=this.el;
oDiv.onmousedown=function(ev){
var disX=ev.clientX-oDiv.offsetLeft;
var disY=ev.clientY-oDiv.offsetTop;
document.onmousemove=function(ev){
var l=ev.clientX-disX;
var t=ev.clientY-disY;
oDiv.style.left=l+‘px‘;
oDiv.style.top=t+‘px‘;
};
document.onmouseup=function(){
document.onmousemove=null;
document.onmouseup=null;
};
};
});
window.onload=function(){
var vm=new Vue({
el:‘#box‘,
data:{
msg:‘welcome‘
}
});
};
</script>
</head>
<body>
<div id="box">
<div v-drag :style="{width:‘100px‘, height:‘100px‘, background:‘blue‘, position:‘absolute‘, right:0, top:0}"></div>
<div v-drag :style="{width:‘100px‘, height:‘100px‘, background:‘red‘, position:‘absolute‘, left:0, top:0}"></div>
</div>
</body>
</html>
ev.clientX-oDiv.offsetLeft
2.自定义元素指令:（用处不大）
Vue.elementDirective(‘zns-red‘,{
bind: function(){
this.el.style.background=‘red‘;
}
});
-------------
@keydown.up
@keydown.enter
@keydown.a/b/c....
自定义键盘信息:
Vue.directive(‘on‘).keyCodes.ctrl=17;
Vue.directive(‘on‘).keyCodes.myenter=13;
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>智能社——http://www.zhinengshe.com</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0">
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<style>
</style>
<script src="vue.js"></script>
<script>
//ctrl->17
/*document.onkeydown=function(ev){
console.log(ev.keyCode);
};*/
Vue.directive(‘on‘).keyCodes.ctrl=17; //
Vue.directive(‘on‘).keyCodes.myenter=13;
window.onload=function(){
var vm=new Vue({
el:‘#box‘,
data:{
a:‘blue‘
},
methods:{
show:function(){
alert(1);
}
}
});
};
</script>
</head>
<body>
<div id="box">
<input type="text" @keydown.myenter="show">
</div>
</body>
</html>
Vue.directive(‘on‘).keyCodes.myenter=13;
监听数据变化:
vm.$el/$mount/$options/....
vm.$watch(name,fnCb); //浅度
vm.$watch(name,fnCb,{deep:true}); //深度监视
原文地址：https://www.cnblogs.com/zyjzz/p/9749764.html
时间： 2024-10-16 05:10:02