这个技巧,出于我无法理解的原因,是将外层循环向下递减(i--),将内层循环向上递增(j++)。
参考以下示例:
function test() {
var array1 = new Array("a","b","c","d","e","f");
var array2 = new Array("c","e");
for (var i = array1.length - 1; i >= 0; i--) {
for (var j = 0; j < array2.length; j++) {
if (array1[i] === array2[j]) {
array1.splice(i, 1);
}
}
}
console.log(array1)
}
我怎么知道这个?看下面:
for( var i =myArray.length - 1; i>=0; i--){
for( var j=0; j<toRemove.length; j++){
if(myArray[i] === toRemove[j]){
myArray.splice(i, 1);
}
}
}
或者
var myArray = [
{name: 'deepak', place: 'bangalore'},
{name: 'chirag', place: 'bangalore'},
{name: 'alok', place: 'berhampur'},
{name: 'chandan', place: 'mumbai'}
];
var toRemove = [
{name: 'deepak', place: 'bangalore'},
{name: 'alok', place: 'berhampur'}
];
for( var i=myArray.length - 1; i>=0; i--){
for( var j=0; j<toRemove.length; j++){
if(myArray[i] && (myArray[i].name === toRemove[j].name)){
myArray.splice(i, 1);
}
}
}
alert(JSON.stringify(myArray));
在此提醒一下,有人能否解释一下为什么外层循环需要向下 (--)?
祝好运!