JavaScript 数値演算 新しいページはコチラ
提供: yonewiki
(→三角関数 sin/cos/tan/asin/acos/atan/atan2) |
(→三角関数 sin/cos/tan/asin/acos/atan/atan2) |
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| 218行: | 218行: | ||
function draw2() { | function draw2() { | ||
var canvas = document.getElementById('c2'); | var canvas = document.getElementById('c2'); | ||
| − | if ( ! canvas || ! canvas.getContext ) { return false; } | + | if ((! canvas) || (! canvas.getContext) ) { return false; } |
var ctx = canvas.getContext('2d'); | var ctx = canvas.getContext('2d'); | ||
ctx.beginPath(); | ctx.beginPath(); | ||
