HTML代码
js代码如下所示:
var tangram = [ {p: [{x: 0, y: 0}, {x: 800, y: 0}, {x: 400, y: 400}], color: "#caff67"}, {p: [{x: 0, y: 0}, {x: 400, y: 400}, {x: 0, y: 800}], color: "#67becf"}, {p: [{x: 800, y: 0}, {x: 800, y: 400}, {x: 600, y: 600}, {x: 600, y: 200}], color: "#ef3d61"}, {p: [{x: 600, y: 200}, {x: 600, y: 600}, {x: 400, y: 400}], color: "#f9f51a"}, {p: [{x: 400, y: 400}, {x: 600, y: 600}, {x: 400, y: 800}, {x: 200, y: 600}], color: "#a594c0"}, {p: [{x: 200, y: 600}, {x: 400, y: 800}, {x: 0, y: 800}], color: "#fa8ecc"}, {p: [{x: 800, y: 400}, {x: 800, y: 800}, {x: 400, y: 800}], color: "#f6ca29"} ];//七巧板的七块图形,p为各顶点坐标,color为颜色window.Onload= function () { var canvas = document.getElementById("canvas"); if (canvas.getContext("2d")) {//判断浏览器是否支持canvas var cOntext= canvas.getContext("2d"); for (var i = 0; i怎么使用select获取选中的值
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