html5 - 关于canvas的save( );和restore( );方法的一个疑惑

Question

如上4图
第二次lineWidth设置比第一次lineWidth设置的值大后
就会导致第一次画出的线段的lineWidth受到影响
请教各位前端大神有什么好的处理方案，可以使得第一次的lineWidth不受影响

Answer 1

The problem is solved
because the .beginPath() method is not added
If you add .beginPath() without save(); and restore();, that’s fine too

Answer 2

The path requires closePath

Answer 3

BeginPath should be added when drawing lines