js中canvas画图里面的画笔的颜色怎么改变

Posted 2023-04-07

参考技术A document.getElememtById("canvas").getContext("2d").fillStyle("red");本回答被提问者采纳

vue里面怎么获取canvas的画笔 这样子是报错啊。。

this.$CANVAS1=$('#canvas1');
// var ctx = c2.getContext("2d");
this.$ctx = this.$CANVAS1.getContext("2d");

参考技术A DataTable dt = new DataTable();
dt.Columns.Add(new DataColumn("PreRevDate0", typeof(decimal)));
DataColumn col = new DataColumn();
col.ColumnName = "PreRevDate1";
col.Expression = "ABS(Convert.ToInt32(PreRevDate0))";
col.DataType = typeof(decimal);
dt.Columns.Add(col);
DataRow dr = dt.NewRow();
dr["PreRevDate0"] = -1;
dt.Rows.Add(dr);