watch
一旦 ready 階段完成，與之關聯的 watch 對象中的監聽函數會被觸發一次。隨後，當數據的某個值發生變動時，會再次觸發相應鍵（key）的監聽函數。
示例代碼
<div id="logger">-</div>
<div style="color:red;">shadow html : <span id="shadowHtml"></span></div>
<script>
setTimeout(()=>{
const ele = document.createElement('test-ready');
},500);
</script>
<div id="logger">-</div>
<div style="color:red;">shadow html : <span id="shadowHtml"></span></div>
<script>
setTimeout(()=>{
const ele = document.createElement('test-ready');
},500);
</script>
<template component>
<div>test watch</div>
<script>
let count = 0;
export default {
tag: "test-ready",
data:{
val: "I am val"
},
watch:{
val(val){
count++;
$("#logger").text = count;
$("#shadowHtml").push(`<div>${val}</div>`);
}
},
ready(){
setTimeout(()=>{
this.val = 'change val';
},500);
}
};
</script>
</template>
生命周期流程圖
