vue水印-第二种方法：通过指令
1、utils文件夹下新建 directives.js：import Vue from 'vue'
Vue.directive('watermark', (el, binding) => {
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 = 400
can.height = 200
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 / 3, can.height / 2)
parentNode.style.backgroundImage = 'url(' + can.toDataURL('image/png') + ')'
}
addWaterMarker(
binding.value.text,
el,
binding.value.font,
binding.value.textColor
)
})View Code
2、main.js中引入
import'@utils/directives'3、在需要使用水印的标签上加上指令
<div class="box" v-watermark="{text:'hello~',textColor:'red'}">
123
</div>效果图：
文档来源：51CTO技术博客https://blog.51cto.com/u_15301829/3068390
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