index.html {代码...} index.js {代码...} router/index.js {代码...} proSkill.vue {代码...} index.css {代码...} 上面显示 aaaa没有半透明导航也没有但是画布中的内容却半透明了这是为什么求教

css - 半透明背景 z-index:-1上层内容不透明但是引入自定义的组件中有canvas的内容都是半透明的-PHP Chinese Network Q&A

index.html

<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8">
    <title>resume</title>
    <script type="text/javascript" src="http://www.chartjs.org/assets/Chart.js">
    </script>


</head>

<body>
    <p id="app1">
        <p class="container">
            aaaaaa
            <topnav></topnav>
            <p class="content">
                <router-view></router-view>
            </p>
        </p>
    </p>
</body>

</html>

index.js

import Vue from 'vue'
    //import Chart from 'chart.js'

require("../css/index.css")
import topnav from '../components/topNav'
import router from '../router';
var app = new Vue({
    el: '#app1',
    components: {
        topnav
    },
    router

})

router/index.js

import Vue from 'vue';
import VueRouter from 'vue-router';

import topnav from '../components/topNav'

var Chart = require('chart.js')

import userInfo from '../components/userInfo'
import proSkill from '../components/proSkill'
import experience from '../components/experience'

Vue.use(VueRouter)

const router = new VueRouter({
    routes: [
        {
            path: '/userInfo',
            component: userInfo
        },
        {
            path: '/proSkill',
            component: proSkill
        },
        {
            path: '/experience',
            component: experience
        }
    ]
});
export default router;

proSkill.vue


<template>
 <p class="skill">
        <canvas id="myChart" width="10" height="10"></canvas>
 </p>
    
</template>
<script>
    window.onload=function(){
        var ctx = document.getElementById("myChart").getContext("2d");
        var data = {
            labels: ["htmml(h5)", "css", "js"],
            datasets: [
               {
                   fillColor : "rgba(151,187,205,0.5)",
                    strokeColor : "rgba(151,187,205,1)",
                    pointColor : "rgba(151,187,205,1)",
                    pointStrokeColor : "#fff",
                    data : [25,20,20]
                }
            ]
        };
        var myRadarChart = new Chart(ctx, {
            type: 'radar',
            data: data,
            options: {
            scale: {
                    reverse: false,
                    ticks: {
                        beginAtZero: true
                    }
                }
            }
        });
}
</script>
<style>
    .skill{
    width: 20rem;
    height: 20rem;
    }
    canvas{
        z-index: 2;
    }
</style>

index.css

body,
html {
    width: 100%;
    height: 100%;
    margin: 0px;
    padding: 0px;
    font-size: 15px;
}

body {
    width: 100%;
    height: 100%;
    background: url("../img/bg.jpg")
}

.container {
    width: 70%;
    min-height: 36rem;
    margin: 4rem auto;
    position: relative;
}

.container:before {
    content: '';
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    position: absolute;
    background: #513b3b;
    border-radius: 1rem;
    opacity: .5;
    z-index: -1;
}

.content {
    width: 100%;
    box-sizing: border-box;
    padding: 0 1rem;
    height: 28rem;
}

上面显示 aaaa没有半透明导航也没有但是画布中的内容却半透明了这是为什么求教