JQuery：select change bind 监听

	$('#xxx_id').unbind('click').bind('click', function() {
		console.log($(this));
	});

获取监听的文本属性

$('#xxx_id').unbind('change').bind('change', function() {
		if(this.options.length > 0){
			host_option_name = '';
			console.log(this.options);
			console.log(this.options.selectedIndex);
			console.log(this.options[this.selectedIndex]);
			console.log(this.options[this.selectedIndex].text);
			text_str = this.options[this.selectedIndex].text;
		}
	});