js中报：TypeError: (intermediate value) is not a function错误

js中报：TypeError: (intermediate value) is not a function错误

let mouse = c.getOffset(canvas);  //这里不加分号会报错，提示c.getOffset is not a function// 前面要加分号，后面也要加，这里和上边都忘记分号时报错
(function drawFrame() {window.requestAnimationFrame(drawFrame);ctx.clearRect(0,0,W,H);x = mouse.x - hx;y = mouse.y - hy;ball.x = x;ball.y = y;ball.render(ctx)})()

 //通过函数构造器定义
function drawSystem(){} // 这里不用加分号
//通过函数表达式定义, 此时我们认为该函数是一个变量
var ball = function(){}; // 这里一定要加分号，不然在后面紧跟一个如下形式的函数封装时会报错(intermediate value)(...) is not a function

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报错如下: 出现这种问题的原因,应该是在代码中有立即执行函数但是立即执行函数前却没有使用分号导致的.不然会被JS编译器错误解析从而报错.还是要注意编码规范啊.
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js中报：TypeError: (intermediate value) is not a function错误

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