?> 给整个页面添加背景水印
使用 canvas 特性生成 base64 格式的图片文件,设置其字体大小,颜色等
将其设置为背景图片,从而实现页面或组件水印效果
function addWaterMarker(str, parentNode, font, textColor) {
// 水印文字,父元素,字体,文字颜色
var can = document.createElement('canvas')
parentNode.appendChild(can)
can.width = 200
can.height = 150
can.style.display = 'none'
var cans = can.getContext('2d')
cans.rotate((-20 * Math.PI) / 180)
cans.font = font || '16px Microsoft JhengHei'
cans.fillStyle = textColor || 'rgba(180, 180, 180, 0.3)'
cans.textAlign = 'left'
cans.textBaseline = 'Middle'
cans.fillText(str, can.width / 10, can.height / 2)
parentNode.style.backgroundImage = 'url(' + can.toDataURL('image/png') + ')'
}
const waterMarker = {
bind: function (el, binding) {
addWaterMarker(binding.value.text, el, binding.value.font, binding.value.textColor)
},
}
export default waterMarker
<template>
<div v-waterMarker="{text:'lzg版权所有',textColor:'rgba(180, 180, 180, 0.4)'}"></div>
</template>