In Highcharts
chart: { renderTo: 'container', width: myWidth, height:350, spacingLeft:-65 },
yAxis: [{ // Primary yAxis tickPositions: [145.00, 150.00, 155.00, 160.00, 165.00], max: 163.50, labels: { formatter: function() { //我想在这里对this.value做判断, 设置chart里的width值 return this.value.toFixed(2); }, }],
I want to know how to write the code
Reply to the discussion (solution)
Go to the next Highcharts manual to read the document development. There are examples in it
No,
you still make the judgment outside.
After the judgment is completed, set the parameters.
Perform data analysis before loading data, calculate your myWidth and then generate the chart.
This is also the standard idea of this kind of static drawing: that is, the performance is determined by data; rather than during execution During the performance rendering process, change other performance parameters
Perform data analysis before loading the data, calculate your myWidth and then generate the chart.
This is also the standard idea for this kind of static rendering. : That is, the performance is determined by data; instead of changing other performance parameters during the performance rendering process
This was done before, but there is a lot of data, and the performance is not very good now. It takes seven seconds to load Left and right.
No,
you still make the judgment outside.
After the judgment is completed, set the parameters.
I have done the data retrieval, but it is slower
7 seconds refers to the chart drawing time, right? It is impossible to perform data processing and it will take 7 seconds!
If It’s the drawing time: your dynamic changes will further reduce performance. You can only find a way to perform step-by-step loading and other processing to ensure that the browser will not get stuck due to too long execution of js code
If It’s the data processing time: If there is no problem with your algorithm logic, it can only be said that the amount of data is indeed too large. The only way to optimize is to load the data step by step
7 seconds refers to the drawing time of the chart, right? It is impossible to perform data processing and it will take 7 seconds!
If it is the drawing time: Your dynamic changes will reduce the performance even more. The only way is to find a way to perform processing such as step loading to ensure that the browser does not It will freeze due to too long execution time of js code
If it is data processing time: If there is no problem with your algorithm logic, it can only be said that the amount of data is indeed too large. The only way to optimize is to load in steps The data
It is still very fast under IE9, but IE8 is very slow. There are too many data checks, how to solve this situation?
General optimization algorithm ideas: reduce the number of traversals (try to only do one traversal), do not use iteration/recursion
For js, Since it is single-threaded, in order to prevent js from being "stuck" within a piece of logic, the data can be loaded in segments

The function of HTML is to define the structure and content of a web page, and its purpose is to provide a standardized way to display information. 1) HTML organizes various parts of the web page through tags and attributes, such as titles and paragraphs. 2) It supports the separation of content and performance and improves maintenance efficiency. 3) HTML is extensible, allowing custom tags to enhance SEO.

The future trends of HTML are semantics and web components, the future trends of CSS are CSS-in-JS and CSSHoudini, and the future trends of JavaScript are WebAssembly and Serverless. 1. HTML semantics improve accessibility and SEO effects, and Web components improve development efficiency, but attention should be paid to browser compatibility. 2. CSS-in-JS enhances style management flexibility but may increase file size. CSSHoudini allows direct operation of CSS rendering. 3.WebAssembly optimizes browser application performance but has a steep learning curve, and Serverless simplifies development but requires optimization of cold start problems.

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HTML is the cornerstone of building web page structure. 1. HTML defines the content structure and semantics, and uses, etc. tags. 2. Provide semantic markers, such as, etc., to improve SEO effect. 3. To realize user interaction through tags, pay attention to form verification. 4. Use advanced elements such as, combined with JavaScript to achieve dynamic effects. 5. Common errors include unclosed labels and unquoted attribute values, and verification tools are required. 6. Optimization strategies include reducing HTTP requests, compressing HTML, using semantic tags, etc.

HTML is a language used to build web pages, defining web page structure and content through tags and attributes. 1) HTML organizes document structure through tags, such as,. 2) The browser parses HTML to build the DOM and renders the web page. 3) New features of HTML5, such as, enhance multimedia functions. 4) Common errors include unclosed labels and unquoted attribute values. 5) Optimization suggestions include using semantic tags and reducing file size.


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