html转canvas html2canvas.js

$("#btn-html2canvas").on("click",function(){//btn-html2canvas为按钮
//content-main为要转换的元素的id
            html2canvas(document.getElementById('content-main'), {
                onrendered: function(canvas) {
                    document.body.appendChild(canvas);
                },
                  300,
                 height: 300
            });
        })