设置如下：
multiselect:true // multi-select checkboxes appear
multiboxonly:true // checkboxes act like radio buttons where only one is selected at a time
转自http://*.com/questions/6756131/jqgrid-single-select-checkbox
设置如下：
multiselect:true // multi-select checkboxes appear
multiboxonly:true // checkboxes act like radio buttons where only one is selected at a time
转自http://*.com/questions/6756131/jqgrid-single-select-checkbox