Javascript Vue js应用程序未在应用程序内定义
我在html页面的脚本标记中包含了vue 1.0.18 min.js specialText行不起作用Javascript Vue js应用程序未在应用程序内定义,javascript,vue.js,undefined,Javascript,Vue.js,Undefined,我在html页面的脚本标记中包含了vue 1.0.18 min.js specialText行不起作用 var tagApp; window.onload = function () { /* Vue Js App here */ tagApp = new Vue({ el: '#app', data: { title: 'Title', chars: [{ name: "Jarred", attack: 15,
var tagApp;
window.onload = function () {
/* Vue Js App here */
tagApp = new Vue({
el: '#app',
data: {
title: 'Title',
chars: [{
name: "Jarred",
attack: 15,
health: 70,
special: "Block",
blockVal: 5,
specialText: "Passive: Blocks "+ tagApp.chars[0].blockVal +" Damage."
// line above: here it doesn't work
// gives: "can't get chars of undefined"
}, {
name: "John"
}]
}
}); // close app
alert(tagApp.chars[0].blockVal); // here it works
getBlockVal(); // here it also works
} // close window.onload
function getBlockVal() {
var arr = [{
name: "henry",
description: "blocks " + tagApp.chars[0].blockVal + " dmg."
}];
alert(arr[0].description);
}
我还尝试了specialText中的以下内容:
this.blockVal
提供未定义的
this.parent.blockVal
给出了未定义的
this.chars[0].blockVal
表示chars未定义
tagApp.chars[0]。blockVal
表示tagApp未定义
请提供帮助。您不能直接在
数据
属性中更新值。使用created
lifecyclehook方法更新数据对象
created: function(){
this.chars[0].specialText = "Passive: Blocks "+ this.chars[0].blockVal +" Damage."
}
关于Vue.jsv1生命周期挂钩。您可以根据需要尝试附加其他生命周期挂钩您不能直接在
数据
属性中更新值。使用created
lifecyclehook方法更新数据对象
created: function(){
this.chars[0].specialText = "Passive: Blocks "+ this.chars[0].blockVal +" Damage."
}
关于Vue.jsv1生命周期挂钩。您可以根据您的需求尝试附加其他生命周期挂钩您不能在其定义中使用
tagApp.chars
对象,这就是它未定义的原因。从chars定义中删除行tagApp.chars[0].blockVal
,一切正常。“如果变量的值仍有待定义,则不能使用该值”
如果运行以下代码,它将正常工作:
var tagApp;
window.onload = function () {
/* Vue Js App here */
tagApp = new Vue({
el: '#app',
data: {
title: 'Title',
chars: [{
name: "Jarred",
attack: 15,
health: 70,
special: "Block",
blockVal: 5,
specialText: "Passive: Blocks " + " Damage."
// line above: here it doesn't work
// gives: "can't get chars of undefined"
}, {
name: "John"
}]
}
}); // close app
alert(tagApp.chars[0].blockVal); // here it works
getBlockVal(); // here it also works
} // close window.onload
function getBlockVal() {
var arr = [{
name: "henry",
description: "blocks " + tagApp.chars[0].blockVal + " dmg."
}];
alert(arr[0].description);
}
不能在其定义中使用
tagApp.chars
对象,这就是它未定义的原因。从chars定义中删除行tagApp.chars[0].blockVal
,一切正常。“如果变量的值仍有待定义,则不能使用该值”
如果运行以下代码,它将正常工作:
var tagApp;
window.onload = function () {
/* Vue Js App here */
tagApp = new Vue({
el: '#app',
data: {
title: 'Title',
chars: [{
name: "Jarred",
attack: 15,
health: 70,
special: "Block",
blockVal: 5,
specialText: "Passive: Blocks " + " Damage."
// line above: here it doesn't work
// gives: "can't get chars of undefined"
}, {
name: "John"
}]
}
}); // close app
alert(tagApp.chars[0].blockVal); // here it works
getBlockVal(); // here it also works
} // close window.onload
function getBlockVal() {
var arr = [{
name: "henry",
description: "blocks " + tagApp.chars[0].blockVal + " dmg."
}];
alert(arr[0].description);
}
好啊谢谢我现在在应用程序之外定义了blockVal,并将其包含在specialText中。这样行,好的。谢谢我现在在应用程序之外定义了blockVal,并将其包含在specialText中。这行得通,这行得通。谢谢但是当我更改blockVal时,specialText仍然使用旧的blockVal值,因为created只调用它一次。因此,我添加了一个方法来更新specialText,它很有效。谢谢但是当我更改blockVal时,specialText仍然使用旧的blockVal值,因为created只调用它一次。因此,我添加了一个方法来更新specialText,它可以正常工作。