Applet get the picture size

Data: { 
    IMG: [], // provided an array 
} 
 
add_img: function () {
     var that = the this , 
    IMG = that.data.img;
         IF (img.length <. 3) {   // if the number is less than three image , images may be acquired directly 
            wx.chooseImage ({ 
                COUNT: . 1,      // default. 9 
                SizeType: [ 'compressed'], // can specify the still picture compression FIG default both have 
                sourceType: [ 'album', ' camera '], // You can specify the source of the album or camera, both have default 
                Success: function (RES) {
                     var= res.tempFiles tempFilesSize [0] .size;   // Get the image size, the unit B 
                    IF (tempFilesSize <= 2,000,000) {    // Image Image acquisition may be performed less than or equal to 2M 
                        var tempFilePaths res.tempFilePaths = [0]; // get image 
                        that.data.img.push (tempFilePaths);    // add to the array 
                        that.setData ({ 
                            IMG: that.data.img 
                        }) 
                    } the else {     // image is larger than 2M, a pop-up message box 
                        wx.showToast ({ 
                            title: 'upload pictures can not be greater than 2M!',   // title
                            icon: 'none'        // icons none Do not use the icon, details see the official document 
                        }) 
                    } 
                } 
            }) 
        } the else {   // direct pop up a prompt box greater than three 
             wx.showToast ({ 
                 title: 'upload pictures can not be greater than 3 Zhang '! , 
                 icon: ' none '    
             }) 
 
        } 
 
}