file控件预览

//files的预览

getObjectURL(file) {

var url = null;

if (window.createObjectURL != undefined) { // basic

url = window.createObjectURL(file);

} else if (window.URL != undefined) { // mozilla(firefox)

url = window.URL.createObjectURL(file);

} else if (window.webkitURL != undefined) { // webkit or chrome

url = window.webkitURL.createObjectURL(file);

}

return url;

},