3
我聽上xhr.onprogressXMLHttpRequestProgressEvent.total總計TOTALSIZE給人錯誤的值
request.onprogress = function(e){
return conf.progress ? conf.progress(e) : null;
};
其中conf.progress是
function(e){
var position = e.position || e.loaded;
var total = e.totalSize || e.total;
var percent = ((e.loaded/e.total)*100)+"";
console.log(percent);
console.log(position, total);
console.log(e);
}
percent產生控制檯錯誤的值像2.789069431137492e-11這就是console.log(e)打印
XMLHttpRequestProgressEvent
bubbles: false
cancelBubble: false
cancelable: true
clipboardData: undefined
currentTarget: undefined
defaultPrevented: false
eventPhase: 2
lengthComputable: false
loaded: 4982035
position: 4982035
returnValue: true
srcElement: undefined
target: undefined
timeStamp: 1323097256269
total: 18446744073709552000
totalSize: 18446744073709552000
type: "progress"
__proto__: XMLHttpRequestProgressEvent
爲什麼e.totalSize: 18446744073709552000是如此之大，甚至後的文件是完全加載e.loaded: 4982035爲totalSize應等於loaded當其完成
我注意到'lengthComputable'在您的情況下是'false'，據我瞭解，這意味着您不能依靠'total '。 當'lengthComputable'爲false時，我無法在線找到'total'的行爲 - 我認爲它是0. David Flanagan的「JavaScript：權威指南」p508是唯一的討論I可以找到 - lengthComputable的所有其他搜索結果顯示使用它的人，但不討論行爲。 –
圖書鏈接：http://books.google.com/books?id=6TAODdEIxrgC&pg=PA508&lpg=PA508&dq=xhr2+lengthcomputable&source=bl&ots=ob9lDTNvXJ&sig=ir83LPAKveZzXDJOJe7-WBE0k1s&hl=en&sa=X&ei=mN36TuGDL8vMrQfPs8nqDw&ved=0CE8Q6AEwBw#v=onepage&q=xhr2% 20lengthcomputable＆F =假 –