为什么我们需要在继承后将import json
def convertMatrix(file_name):
final_list = []
try:
with open(file_name, "r") as sparse_mat:
matrix = sparse_mat.readlines()
for row in matrix:
each_dct = {}
row_vals = row.rstrip("\n").split()
if row_vals:
each_dct["Flag"] = row_vals[0]
for col_elem in row_vals[1:]:
if ":" in col_elem:
each_col_val = col_elem.split(":")
column_name = "Col"+each_col_val[0]
column_val = str(each_col_val[1])
each_dct[column_name] = column_val
final_list.append(each_dct)
except Exception as e:
print "Exception occured", e
return final_list
print convertMatrix("demo.text")
属性设置为Child.prototype.constructor。例如
Child正如我所看到的，构造函数的实例在没有function Parent(a){
this.a = a;
}
function Child(a, b){
Parent.call(this. a);
this.b = b;
}
Child.prototype = Object.create(Parent.prototype);
Child.prototype.constructor = Child // 1)**
行
为什么我们需要此// 1) **行？
答案 0 :(得分：0)
因为它不应该是相同的
语言语法Child.prototype.constructor应该是Object.create(Parent.prototype).constructor的实例，实际上是Parent.prototype.constructor
然后由引擎实现或优化。但它不能信任，因此// 1)行确保它