vue retains two decimal places to supplement 0

In Vue development, we usually need to retain a few decimal places, such as currency prices, percentage values, etc. However, sometimes we find that when the number is less than two decimal places, the display will not be beautiful. In order to solve this problem, this article will introduce a method: retain two decimal places and supplement 0.

Vue.js is a lightweight JavaScript framework that provides a simple and flexible API to easily build modern single-page web applications. By combining different instructions and components, we can design complex UI interfaces and provide powerful data binding and responsive interactions.

Vue.js provides a concept of filter (filter) for formatting output data. The filter can receive a specific input value (which can be a string, number, object, array, etc.) and return a new output value after some specified processing methods. Filters can be used in templates or defined and called in components.

Define a filter in Vue.js, which can be implemented through the Vue.filter() method. For example:

Vue.filter('myFilter', function(value) {
  // 对value进行处理
  return processedValue;
})

The above code defines a filter named myFilter, which is used to process the input value value and return the processed new value processedValue.

So how can we achieve the supplementary 0 we need to retain two decimal places? We can use the toFixed() method in JavaScript. This method can retain a number to a specified number of decimal places and automatically fill in the missing digits.

For example:

var num = 3.1415926;
console.log(num.toFixed(2));   // 输出3.14
console.log(num.toFixed(5));   // 输出3.14159

The toFixed() method returns a string type value. If you want to get a numeric type value, you can use the parseFloat() method or the unary plus operator ( ) .

For filters in Vue.js, we can use the toFixed() method to implement the function of retaining two missing decimal places and adding 0. For example:

Vue.filter('fixed2', function(value) {
  return parseFloat(value).toFixed(2);
})

The above code defines a filter named fixed2, which is used to retain two decimal places of the input value value, perform padding operations, and finally return a string type value.

Using this filter can realize the requirement of automatically filling in zeros if there are not enough two decimal places left in the template. For example:

{{ price | fixed2 }}

The above code means that the value of the variable price is supplemented with 0 with two decimal places, and output in the p tag in the HTML page.

To summarize, the supplementary 0 that retains two decimal places can be implemented through the filter in Vue.js, and the toFixed() method in JavaScript is used to complete the specific operation. Filters are a very important feature of Vue.js, which can help us format data and improve the readability and maintainability of the code. In actual development, we can use filters to process various data types to meet different business needs.

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