添加的文字是写入图片的,文字会随着图片的大小、位置改变而改变

完成的效果:

代码:

<template>
    <div>
        <div>写入前</div>
        <img src="https://img0.baidu.com/it/u=1384155777,1106731832&fm=253&fmt=auto&app=138&f=JPEG?w=600&h=400" />
        <div>写入后</div>
        <img :src="currentImg">
    </div>
</template>
<script>
export default {
    data() {
        return {
            currentImg: ""
        }
    },
    mounted() {
        this.addTextEvent()
    },
    methods: {
        addTextEvent() {
            var _this = this
            let canvas = document.createElement("canvas");
            canvas.width = 600;
            canvas.height = 400;
            let myImage = new Image();
            myImage.src = "https://img0.baidu.com/it/u=1384155777,1106731832&fm=253&fmt=auto&app=138&f=JPEG?w=600&h=400";  // 需要添加文字的图片
            myImage.crossOrigin = "Anonymous";
            let context = canvas.getContext("2d");
            myImage.onload = function () {
                context.drawImage(myImage, 0, 0, canvas.width, canvas.height);
                context.font = "20px Courier New";
                context.fillStyle = 'red'
                // context.textAlign = 'end' //文字右对齐
                context.fillText("我是写入的文字", 250, 350);  // 文字的内容和位置
                let base64 = canvas.toDataURL("image/png"); // "image/png" 这里注意一下
                _this.currentImg = base64
            }
        }
    },
}
</script>