TypeScript：无法读取 [null] 中未定义的属性“push”
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TypeScript: Cannot read property 'push' of undefined in [null]
提问by Ng2-Fun
Error: Cannot read property 'push' of undefined in [null].
Error: Cannot read property 'push' of undefined in [null].
class A implements OnInit {
stringArr: string[];
ngOnInit() {
for(let i=0; i<4; i++) {
this.stringArr.push("aaa");
}
}
}
回答by Ng2-Fun
The array needs to be initialized:
数组需要初始化：
stringArr = [];
回答by SeanMC
For me the syntax was a little more than the accepted answer because I was using a full array type.
对我来说，语法比接受的答案要多一点，因为我使用的是完整的数组类型。
stringArr: Array<String> = [];
回答by Manish Bhavnani
class A implements OnInit {
stringArr: string=[];
ngOnInit() {
for(let i=0; i<4; i++) {
this.stringArr.push("aaa");
}
}
}
Here stringArris defined as string, but not as an array of string. Define stringArras blank array [].
这里stringArr定义为字符串，而不是字符串数组。定义 stringArr为空数组[]。
