h5网页水印SDK的实现代码示例

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size: 字体大小

color: 字体颜色

id: canvasId

text: 文本内容

density: 间距

clarity: 清晰度

supportTip: Canvas不支持的文字提示

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let body = document.getElementsByTagName(‘body‘);

  let canvas = document.createElement(‘canvas‘);

  canvas.style.cssText= ‘position: fixed;width: 100%;height: 100%;left:0;top:0;z-index: -1;‘;

  body[0].appendChild(canvas);

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let canvas = document.getElementById(this.params.id);

     let cxt = canvas.getContext(‘2d‘);

     let times = window.screen.width * this.params.clarity / this.params.density;//横向文字填充次数

     let heightTimes = window.screen.height * this.params.clarity * 1.5/ this.params.density; //纵向文字填充次数

     cxt.rotate(-15*Math.PI/180); //倾斜画布

     for(let i = 0; i < times; i++) {

       for(let j = 0; j < heightTimes; j++) {

         cxt.fillStyle = this.params.color;

         cxt.font = this.params.size + ‘ Arial‘;

         cxt.fillText(this.params.text, this.params.density*i, j*this.params.density);

       }

     }

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let self = this;

  window.setInterval(function(){

  if (!document.getElementById(self.params.id)) {

  self._init();

  }

  }, 1000);

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var gulp = require(‘gulp‘),

      uglify = require("gulp-uglify"),

      babel = require("gulp-babel");

  gulp.task(‘minify‘, function () {

      return gulp.src(‘./src/index.js‘) // 要压缩的js文件

      .pipe(babel())

      .pipe(uglify())

      .pipe(gulp.dest(‘./dist‘)); //压缩后的路径

  });