用indexOf方法来去重

var arr = [1,3,4,5,6,7,4,3,2,4,5,6,7,3,2];
function find(){
var newArr = [];
for (var i = 0; i < arr.length; i++) {
if (newArr.indexOf(arr[i]) == -1 ) {
newArr.push(arr[i]);
}
}
document.write(newArr);
}
find(arr);