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@@ -20,8 +20,8 @@ export default class JoyStick {
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a.style.position = "absolute",
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a.style.width = "200px",
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a.style.height = "200px",
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- a.style.left = String(n.left),
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- a.style.bottom = String(n.bottom),
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+ a.style.left = String(n.left || 0),
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+ a.style.bottom = String(n.bottom || 0),
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a.style.zIndex = "999",
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a.style.userSelect = "none",
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a.style.webkitUserSelect = "none",
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zhouenguang