How to use jquery api

In this article we will share with you the jquery api usage instructions, hoping to help everyone.

jQuery.inArray() function is used to search for a specified value in an array and return its index value. If the value does not exist in the array, -1 is returned.

This function belongs to the global jQuery object.

Syntax

jQuery 1.2 adds the static function.

jQuery.inArray( value, array [, fromIndex ] )

Parameter Parameter Description

value Any type for The value to look for.

array Array type specifies the array to be searched.

fromIndex Optional/Number type specifies to start searching from the specified index position of the array, the default is 0.

Return value

The return value of the jQuery.inArray() function is of type Number, which returns the index of the specified value in the array. If not found, -1 is returned.

If there are multiple identical values ​​in the array, the index of the first value found shall prevail.

Note: If you want to determine whether the specified value exists in the array, you need to determine whether the return value of the function is not equal to (or greater than) -1.

Example & Description

The jQuery sample code of jQuery.inArray() function is as follows:

//在当前页面内追加换行标签和指定的HTML内容
function w( html ){
document.body.innerHTML += "<br/>" + html;
}
var arr = [ 10, 25, 3, 0, -3 ];

w( $.inArray( 25, arr ) ); // 1
w( $.inArray( -3, arr ) ); // 4
w( $.inArray( 10, arr ) ); // 0

// 数组中没有99
w( $.inArray( 99, arr ) ); // -1
// 数组中有数字10，但是没有字符串"10"
w( $.inArray( "10", arr ) ); // -1

Run the code

5 0

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The above content is about the usage instructions of jquery api, I hope it can help everyone.

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