如何在打字稿Angular 4中将字符串转换为布尔值 [英] How to convert string to boolean in typescript Angular 4

问题描述

我知道不是第一个提出这个问题的人，正如我在标题中提到的那样，我正在尝试将字符串值转换为布尔值.

I know am not the first to ask this and as I mentioned in my title ,I am trying to convert string value boolean .

我以前已经将一些值放入本地存储中，现在我想获取所有值并将所有值分配给一些布尔变量.

I have previously put some values into local storage,Now I want to get all the values and assign all to the some boolean variables .

app.component.ts

app.component.ts

localStorage.setItem('CheckOutPageReload', this.btnLoginNumOne + ',' + this.btnLoginEdit);

此处this.btnLoginNumOne和this.btnLoginEdit是字符串值("true，false").

mirror.component.ts

mirror.component.ts

if (localStorage.getItem('CheckOutPageReload')) {
      let stringToSplit = localStorage.getItem('CheckOutPageReload');
      this.pageLoadParams = stringToSplit.split(',');

      this.btnLoginNumOne = this.pageLoadParams[0]; //here I got the error as boolean value is not assignable to string
      this.btnLoginEdit = this.pageLoadParams[1]; //here I got the error as boolean value is not assignable to string
}

该组件中的

this.btnLoginNumOn e和this.btnLoginEdi t是布尔值值；

in this component this.btnLoginNumOne and this.btnLoginEdit are Boolean values;

我尝试了stackoverflow中的解决方案，但没有任何效果.

I tried the solutions in stackoverflow but nothing is worked.

谁能帮我解决这个问题.

Can anyone help me to fix this .

推荐答案

方法1:

var stringValue = "true";
var boolValue = (/true/i).test(stringValue) //returns true

方法2:

var stringValue = "true";
var boolValue = (stringValue =="true");   //returns true

方法3:

var stringValue = "true";
var boolValue = JSON.parse(stringValue);   //returns true

方法4:

var stringValue = "true";
var boolValue = stringValue.toLowerCase() == 'true'; //returns true

方法5:

var stringValue = "true";
var boolValue = getBoolean(stringValue); //returns true
function getBoolean(value){
   switch(value){
        case true:
        case "true":
        case 1:
        case "1":
        case "on":
        case "yes":
            return true;
        default: 
            return false;
    }
}

来源: http://codippa.com/how-to -convert-string-to-boolean-javascript/

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