1、indexof
The indexOf function returns the index of the first array item that equals your parameter. For example,myObservableArray.indexOf(‘Blah‘) will return the zero-based index of the first array entry that equalsBlah, or the value -1 if no matching value was found.
个人理解:observableArray.indexOf(key)函数返回的是observableArray数组里面第一个和“key”相同的数组项的索引(即下标),如果数组里面没有与“key”相同的数组项,则返回“-1”。例如:
1 var strObservableArray = ko.observableArray([‘bin‘,‘int‘,‘int‘,‘lao‘]); 2 alert(strObservableArray.indexOf(‘int‘));//输出“1” 3 alert(strObservableArray.indexOf(‘abc‘));//输出“-1”
2、slice(tart,end)
The slice function is the observableArray equivalent of the native JavaScript slice function (i.e., it returns the entries of your array from a given start index up to a given end index). CallingmyObservableArray.slice(...) is equivalent to calling the same method on the underlying array (i.e.,myObservableArray().slice(...)).
参考:
JavaScript中的slice:https://www.baidu.com/link?url=S9Apxg_qRI5Y30Z4-52aKUe1DECUBMsnPM0vElh1A5dXw_1e56nzL0QGbYSzJoA3vZ__KC4koNo5kUfikHY1U_&wd=&eqid=c39b3d760000e2e60000000455a8b383
个人理解:slice(tart,end)将返回数组中从start起到end的数组项组成的新数组。