ajax 2.0 使用语法

< script >

//ajax2.0

$( "#feature"). change( function(){

var formData = new FormData();

formData. append( 'preview', this. files[ 0]);

$. ajax({

url: 'http://www.baixiu.com/admin/API/06.imgPreview.php',

data:formData,

type: 'post',

processData: false, //不自动格式化数据

contentType: false, //不自动设置请求头

success : function( backData){

console. log( backData);

$( '.help-block'). attr( 'src', backData). show();

}

})

})