Can not read property 'defaultView' of undefined error resolved

　　When we went to use $ .ajax data exchange method in an event

	$('.btn_box').click(function() {
		$.ajax({
			type: 'post',
			url: '',
			dataType: 'json',
			contentType: 'application/json; charset=utf-8',
			async: false,
			success: function(res) {
				console.log($(this))
				
			}
		})
	})            

　　

　　At this point in the console title will be reported as the same error,

　　　　1. Because the $ .ajax () of $ (this) I have not dealt with before, and in the $ .ajax () it refers ajax jQuery object itself;

　　Solution:　　

	$('.btn_box').click(function() {
		$.ajax({
                        context: this,
			type: 'post',
			url: '',
			dataType: 'json',
			contentType: 'application/json; charset=utf-8',
			async: false,
			success: function(res) {
				console.log($(this))
				
			}
		})
	})      

　　Only you need to add a context in ajax in: this locking element to solve the current problem! ! !