jquery Traversal checkbox notes Note _jquery

These two days when doing a front-end project, you want to iterate through the checkbox on the page using jquery, with the following code:

Copy Code code as follows:

var val_instancecodestr = "";

$ ("input[type= ' checkbox '] [name= ' Chk_jvmmachinename ']:checked"). each (
function () {
Val_instancecodestr + = "," +$ (This). Val ();
}
);

Variable val_instancecodestr last or empty string, function functions are not executed;

On the Internet to compare the data to find that the code is not wrong, the last found is [type= ' checkbox '] [name= ' chk_jvmmachinename '] between more than one space, and resulting in not getting the CheckBox object

jquery multiple selectors cannot be separated by spaces