js中setinterval与settimeout用法（JS中setInterval与setTimeout用法）.doc

js中setinterval与settimeout用法（JS中setInterval与setTimeout用法） The use of SetInterval and setTimeout in JS Set delay in JS: Using SetInterval and setting the delay function, setTimeout is very similar. SetTimeout is used to delay a period of time and then perform an operation. SetTimeout (function, time) sets a timeout object SetInterval (function, time) sets a timeout object SetInterval is automatic repeat, setTimeout will not repeat. ClearTimeout (object) clears the setTimeout object that has been set ClearInterval (object) clears the setInterval object that has been set Use the timer to implement deferred execution or repeated execution of JavaScript The window object provides two ways to implement the timer, window.setTimeout () and window.setInterval, respectively. The former allows a piece of code to run after a specified time, while the latter allows a code to run once every specified time. Their prototype is as follows: Window.setTimeout (expression, milliseconds); Window.setInterval (expression, milliseconds); Among them, expression can be used in quotes a section of code, can also be a function name, at the appointed time, the system will automatically call the function, when using the function name as call handle, not with any parameters; and the use of a string, you can write parameters to pass in the the. The second parameter of the two method is milliseconds, which represents the delay or the number of milliseconds executed repeatedly. The following two methods are introduced. 1.window.setTimeout method This method can delay execution of a function, for example: script language=, JavaScript, type=, text/javascript ! -- Function, hello () { Alert (hello); } Window.setTimeout (Hello, 5000); //-- /script This code will open the page for 5 seconds and display the dialog box Hello. The last sentence can also be written as: Window.setTimeout (Hello ()) 5000; Readers can appreciate their differences and have the same nature in the window.setInterval method. If the