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A good example about js memory leak

I changed someone else's example and I think it's more compact like this! To paraphrase other people's words, when a DOM object contains a reference to a Js object (such as an Event Handler), and this Js object holds a reference to the DOM obj

2025-02-06
Three implementation methods for javascript to intercept the specified string from the right

Intercept fg on the right side of abcdefg Method 1<script> string="abcdefg" alert(string.substring(string.length-2,string.length)) </script>Method 2<script>

2025-02-06
js sample code to determine whether a control has focus

JS determines that an object has gained focus document.activeElement.tagName //tagName tag name example: determines that the input method is closed when the body obtains the cursor. Copy the code as follows: var act = document.activeElement.t

2025-02-06
Non -recursive post -sequential calendar example examples

In the non -recursive traversal traversing of the prelude, medium, and post -order, the post -order is the most troublesome. If you only retain the pointer of the pointing node in the stack, it is not enough. Some additional information must be stored in

2025-02-06
HTML5 implements its own progress bar and slider effects

1. H5 comes with a progress bar<div id=d><p id=pgv> schedule:%</p><progress id=pg max= value=></progress></div> Use the progress tag to set the min and max values. available

2025-02-06
JS local preview simple implementation method

Copy code code as follows: // JavaScript Documenteval (Function (P, A, C, K, E, R) {E = Function (C) {R <62? ': E (C/62)) )+((c=c%62)>35?S

2025-02-06
Example code of HTML in a regular expression test form

Let ’s share with you the instance code of HTML with html"> regular expression test form. The specific code content is as follows: <span style=font-size:24px;color:#cc6600;>The regular expression is a very useful method of testing the rules of the

2025-02-06
HTML5+CSS3 Implementation of plug -in and dragging upload pictures (support preview and batches)

Uploading is basically often appeared in the project. Generally use: 1. Form submit 2. Flash3, HTML5Form submitting the meeting to refresh the page, it is difficult to achieve asynchronous upload; Flash may be used more, because it can take into account a

2025-02-06
The difference between the four extension of the expansion name of .html, .htm, .shtml and .shtm

Many friends just started to contact the webpage production and found that so many expansion names. In fact, both HTM and HTML are the same. The same is the same as SHTM and SHTML. Note that for website optimization, it is recommended to use the same suff

2025-02-06
One line of code solves various IE compatibility issues (IE6-IE10)

X-UA-COMPATIBLE is used to specify the Modelx-UA-compatible header label of the IE browser to analyze the compilation page is not sensitive. It must be used in Head and must be used before other Meta except Title. 1. Use a line of code to specify the brow

2025-02-06
Perfect solution to the problem of incomparable RGBA () under ie8

RGBA () is a new attribute of CSS3, so IE8 and below browsers are not compatible. What should I do? I finally found a solution. Let ’s explain the meaning of the following RGBARGBA: RGBA: R represents Red, G represents Green, B represents Blue, A represen

2025-02-06
Example of html2canvas implementing dashed dotted border

html2canvas is a library that generates canvas from html elements. Most of the styles of the drawn canvas are consistent with CSS. For example, as of 1.0.0-alpha.12, the dotted border is still drawn as a solid line, and there is still a problem with borde

2025-02-06
A brief discussion on Javascript execution order

Javascript is executed in a top-down order. Unless you specify otherwise, the Javascript code will not wait until the page is loaded before executing. For example, a web page contains the following HTML code: Copy the code as follows:<div id="ele"> welcom

2025-02-06
JavaScript returns to the implementation code of the top effect

Copy code code as follows: // SPEED rolling speed Time time interval function Gototop (speard, time) {speed = speed || 0.1; time = time || 16; // The horizontal distance VAR X of the rolling bar to the top of the page

2025-02-06
Introduction to simple Map examples using javascript

Copy the code as follows: /* * MAP object, implement MAP function * * Interface: * size() Get the number of MAP elements * isEmpty() Determine whether the MAP is empty * clear() Delete all elements of the MAP * put(key, value ) to MAP

2025-02-05

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