jquery设置select选中

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/*设置select选中开始*/             var prod_type=$('.prod_type').val();             //alert(prod_type);             var select = document.getElementById("prod_type_name");              for(var i=0; i<select.options.length; i++){                                if(select.options[i].value == prod_type){                                            select.options[i].selected = true;                      break;                  }              }             /*设置select选中结束*/