JavaScript tutorial. JavaScript is the programming language of the Web. All modern HTML pages use JavaScript, which is very easy to learn. This tutorial will teach you to learn from basic to advanced JavaScript knowledge. JavaScript online examples This tutorial contains a large number of JavaScript examples.
the use of ref ref the role is to convert a primitive data type into a data type with a reactive attribute (reactivity), there are 7 primitive data types, which are: String Number Boolean Null Undefined Symbol : It is…
We sometimes encounter the problem of calling setTimeout in a loop to iterate over, as shown below. The output result will only be 5 6, because JavaScript is single-threaded, executed sequentially, setTimeout is an asynchronous function, it will put the timer function…
Running setTimeout in a for loop is a very common pattern for front-end development. Recently, I was tested on a related question and found it very interesting and easy to make mistakes, so I recorded it as a study note.Let’s…
he output may cause you to question two points:1) the delay time is also 0, so why execute the following for loop first?2) why does the for loop at loop 1 output 3 and the for loop at loop 2…
the first type of var declares a variable Since JavaScript is single-threaded and executes sequentially, setTimeout is an asynchronous function that puts the intrinsic into the task queue, and at this point the loop is executed before executing the intrinsic,…
Official explanation: Force vue instances to re-render. Note that it affects only the instance itself and the subcomponents that insert the contents of the slot, not all subcomponents.equivalent to manually triggering render() this.$forceUpdate();perform forced rendering. for example, there are too…
It is pointed out in the official documentation of Vue that it has the effect of forcing refresh. That in the vue framework, if there is a variable: age, modify it, the page will be updated automatically.However, if the variable…
preface presumably many small partners in the use of vue, have encountered obviously modify the data in the data, but the view is not updated the situation, this time experienced small partners, not to mention the direct call to this.$forceupdate…
use of this.$set when i usually use vue for development, i often encounter a problem like this: that is, when the data contains a declared and assigned object or an array (array package object), we want to add a new…
