Improving User Experience: Effective Strategies to Reduce Rollbacks and Redraws

Improve user experience: Effective ways to reduce reflows and redraws, specific code examples are required

User experience is one of the key factors for the success of a website or application. In order to ensure a smooth user experience and efficient operation, we need to focus on reducing the number of reflows (Refow) and repaint (Repaint) and minimize their impact on performance. This article will introduce several effective methods and provide corresponding code examples.

1. Reasonable use of CSS properties

When writing CSS code, we should pay attention to using appropriate CSS properties to reduce the number of reflows and redraws. Some common CSS properties that trigger reflow and redraw include changing the size, position, and layout of elements. For example, using transform attributes (such as translate, scale, rotate, etc.) instead of left and top attributes can effectively reduce the number of reflows. In addition, using an element with a fixed position attribute can remove it from the document flow, thereby reducing reflow and redrawing.

Sample code 1:

// 减少回流和重绘
.element {
    transform: translate(100px, 100px);
    position: fixed;
}

2. Batch operation of DOM elements

In JavaScript, operating on the DOM will cause reflow and redrawing. If we need to perform similar operations on multiple DOM elements, we should try to merge them together to avoid unnecessary reflow and redrawing triggered by multiple operations. Code can be optimized using DocumentFragment objects or techniques that process DOM elements offline.

Sample code 2:

// 批量操作DOM元素
var fragment = document.createDocumentFragment();
    
for (var i = 0; i < 100; i++) {
    var element = document.createElement('div');
    element.innerHTML = 'Element ' + i;
    fragment.appendChild(element);
}

document.body.appendChild(fragment);

3. Optimization using animation effects

Animation effects are a common means to improve user experience, but frequent animation operations also Will cause reflow and redraw to occur frequently. In order to improve performance, we can use CSS3 hardware acceleration to reduce CPU consumption, such as using the transform and opacity properties to implement animation. In addition, it is recommended to use the requestAnimationFrame method to optimize animation rendering. It will be called before each frame to ensure the smoothness of the animation.

Sample code 3:

// 使用CSS3硬件加速和requestAnimationFrame优化动画效果
function animateElement(element, from, to, duration) {
    var start = performance.now();
  
    function animate(time) {
        var progress = Math.min((time - start) / duration, 1);
        var value = from + progress * (to - from);
        element.style.transform = 'translateX(' + value + 'px)';
        element.style.opacity = value / to;
      
        if (progress < 1) {
            requestAnimationFrame(animate);
        }
    }
  
    requestAnimationFrame(animate);
}

var element = document.getElementById('element');
animateElement(element, 0, 100, 1000);

Summary:

By rationally using CSS properties, batch operating DOM elements and optimizing animation effects, we can effectively reduce the number of reflows and redraws , improve user experience and performance. It should be noted that in actual development, we should optimize according to specific scenarios and conduct comprehensive consideration of performance testing and optimization solutions. Only effective optimization based on specific needs can achieve a better user experience.

(Note: The above example code is for reference only. The specific implementation depends on the scenario and needs, and may need to be appropriately adjusted and optimized according to the specific situation.)

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