function getQueryVariable ( variable )
var query = window. location . search . substring ( 1 ) ;
var vars = query. split ( "&" ) ;
for ( var i = 0 ; i < vars. length ; i ++ ) {
var pair = vars [ i ] . split ( "=" ) ;
if ( pair [ 0 ] == variable ) { return pair [ 1 ] ; }
return ( false ) ;

url 实例：

https://www.runoob.com/index.php?id=1&image=awesome.jpg 调用 getQueryVariable("id") 返回 1。

调用 getQueryVariable("image") 返回 "awesome.jpg"。