HTML DOM Script defer property
Examples
Check whether the script is executed when the page is completed Resolution:
var x = document.getElementById("myScript").defer
x The output is:
true
try it"
Definition and Usage
Whether to perform script defer property sets or returns when the page has finished parsing.
This property reflects defer attribute <script> tag.
Note: defer property applies only to external script (only when using the src attribute).
Note: There are several ways to perform an external script:
- If async = "async": script asynchronously with respect to the rest of the page execution (when the page continues to be parsed, the script will be executed)
- When the script execution will be completed parsing the page: If you do not use the async and defer = "defer"
- If neither use nor async defer: Before the browser to continue parsing the page, immediately read and execute scripts
Browser Support
All major browsers support defer attribute.
Note: Opera version 12 and earlier are not supported defer property.
grammar
Back defer attributes:
scriptObject .defer
Setting defer properties:
scriptObject .defer=true|false
Property Value
| 值 | 描述 |
|---|---|
| true|false |
规定当页面完成解析时是否执行脚本。
|
technical details
| return value: | Boolean value, if and when the page has finished executing the script parsing, it returns true, otherwise returns false. |
|---|
related articles
HTML Reference Manual: HTML <Script> the defer attribute