fix: 修复内置组件img设置图片长度和宽度不生效

[lizhijie429]

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PR

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PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
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Background and solution

What is the current behavior?

Issue Number: #180

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[lizhijie429]

bug的主要原因：样式以class形式应用于画布，权重低于行内样式，解决思路：如果属性已经在行内样式中了，应该修改行内样式的数据。#189的pr直接删除了行内样式的数据。

[Issues-translate-bot]

Bot detected the issue body's language is not English, translate it automatically.

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The main reason for the bug: the style is applied to the canvas in the form of a class, and its weight is lower than that of the inline style. Solution: If the attribute is already in the inline style, the data of the inline style should be modified. The PR of #189 directly deletes the inline style data.