javascript获取URL查询字符串

function getArgs( ) {
var args = new Object( );
var query = location.search.substring(1); // Get query string
var pairs = query.split("&"); // Break at ampersand
for(var i = 0; i < pairs.length; i++) {
var pos = pairs[i].indexOf('='); // Look for "name=value"
if (pos == -1) continue; // If not found, skip
var argname = pairs[i].substring(0,pos); // Extract the name
var value = pairs[i].substring(pos+1); // Extract the value
value = decodeURIComponent(value); // Decode it, if needed
args[argname] = value; // Store as a property
}
return args; // Return the object
}

alert(getArgs()['str']);
或
alert(getArgs().str);