vue2和vue3页面加自定义水印（组件化）

// -----------------------vue3 -------------------------
<!-- Watermark.vue --><template><div class="watermark" ref="watermark"></div>
</template><script setup lang="ts">import { onMounted, ref } from 'vue';const props = defineProps({text: {type: String,required: false,default: "我是水印"}});const watermark = ref(null);const addWatermark = (text) => {const watermarkDiv = watermark.value;const canvas = document.createElement('canvas');//在以下调整水印canvas.width = 200;canvas.height = 280;const ctx = canvas.getContext('2d');ctx.rotate(-45 * Math.PI / 180);ctx.font = '18px Arial';ctx.fillStyle = 'rgba(180, 180, 180, 0.3)';ctx.textAlign = 'center';ctx.textBaseline = 'middle';ctx.fillText(text, canvas.width / 2, canvas.height / 2);watermarkDiv.style.backgroundImage = `url(${canvas.toDataURL('image/png')})`;watermarkDiv.style.pointerEvents = 'none';watermarkDiv.style.position = 'fixed';watermarkDiv.style.top = 0;watermarkDiv.style.left = 0;watermarkDiv.style.width = '100%';watermarkDiv.style.height = '100%';watermarkDiv.style.zIndex = 9999;};onMounted(() => {addWatermark(props.text);});
</script><style scoped>.watermark {background-repeat: repeat;}// --------------其他页面引用组件，这个就不写了

// ----------------------------------vue2
<!-- Watermark.vue -->
<template><div class="watermark" ref="watermark"></div>
</template><script>
export default {props: {text: {type: String,required: false,default: "我是水印"}},mounted() {this.addWatermark(this.text);},methods: {addWatermark(text) {const watermarkDiv = this.$refs.watermark;const canvas = document.createElement('canvas');canvas.width = 200;canvas.height = 200;const ctx = canvas.getContext('2d');ctx.rotate(-20 * Math.PI / 180);ctx.font = '20px Arial';ctx.fillStyle = 'rgba(200, 200, 200, 0.50)';ctx.textAlign = 'center';ctx.textBaseline = 'middle';ctx.fillText(text, canvas.width / 2, canvas.height / 2);watermarkDiv.style.backgroundImage = `url(${canvas.toDataURL('image/png')})`;watermarkDiv.style.pointerEvents = 'none';watermarkDiv.style.position = 'fixed';watermarkDiv.style.top = 0;watermarkDiv.style.left = 0;watermarkDiv.style.width = '100%';watermarkDiv.style.height = '100%';watermarkDiv.style.zIndex = 9999;}}
};
</script><style scoped>
.watermark {background-repeat: repeat;
}
</style>// --------------其他页面引用组件，这个就不写了