如何解决我正在尝试创建一个 if 语句来对我的对象数组中的不同类型的值进行排序
我想要一个代码,它为我提供对象属性值的值,然后采用具有该值的 if 语句,以便获得正确的 console.log。
带对象的数组。
var stoneData = [];
stoneData.push({type:"lineto",point:"test",axis:{x:0,y:0}} + ' = test data 1');
stoneData.push( ' ' + {type:"moveto",y:0}} + ' = test data 2');
stoneData.push(' ' + {type:"quadraticCurveto",axis:{curveX:0,curveY:0,x:0,y:0}} + '= test data 3');
If 语句
var i = 0;
if(stoneData[i].type == "moveto" || stoneData[i].type == "lineto" ) {
console.log('stoneData[' + i + '].type = ' + stoneData[i].type + ',stoneData[' + i + '].point = ' + stoneData[i].point + ',stoneData['+i+'].axis.x = ' + stoneData[i].axis.x + ',stoneData['+i+'].axis.y = ' + stoneData[i].axis.y);
} else if(stoneData[i].type == "quadraticCurveto") {
console.log('stoneData[' + i + '].type = ' + stoneData[i].type + ',stoneData['+i+'].axis.curveX = ' + stoneData[i].axis.curveX + ',stoneData['+i+'].axis.curveY = ' + stoneData[i].axis.curveY + ',stoneData['+i+'].axis.y = ' + stoneData[i].axis.y);
} else {
return console.log("something went wrong");
}
//next console.log(stoneData[i]);
i += 1;
if(stoneData[i].type == "moveto" || stoneData[i].type == "lineto" ) {
console.log('stoneData[' + i + '].type = ' + stoneData[i].type + ',stoneData['+i+'].axis.y = ' + stoneData[i].axis.y);
} else if(stoneData[i].type == "quadraticCurveto") {
console.log('stoneData[' + i + '].type = ' + stoneData[i].type + ',stoneData['+i+'].axis.y = ' + stoneData[i].axis.y);
} else {
return console.log("something went wrong");
}
我也尝试过其他不同的方法。
我找不到正确的查找方法 (stoneData[index].type == value
)。
我做编程还不到一年,所以我还不太擅长预先回答。
这是新代码:
var stoneData = [];
stoneData.push({type:"lineto",y:0}} + '= test data 3');
function consoleTheData() {
//log the data
console.log('stoneData = ' + stoneData);
console.log('stoneData.length in index = ' + (stoneData.length - 1));
for (let i = 0; i < stoneData.length; i++) {
switch (stoneData[i].type) {
case "moveto":
case "lineto":
console.log('stoneData[' + i + '].type = ' + stoneData[i].type + ',stoneData['+i+'].axis.y = ' + stoneData[i].axis.y);
break;
case "quadraticCurveto":
console.log('stoneData[' + i + '].type = ' + stoneData[i].type + ',stoneData['+i+'].axis.y = ' + stoneData[i].axis.y);
break;
default:
console.log("something went wrong");
}
}
}
consoleTheData();
解决方法
尝试这样的事情
const stoneData = [
{ type: "moveTo",point: 112,axis: { x: 123,y: 123 } },{ type: "lineTo",{ type: "moveTo",{ type: "quadraticCurveTo",{ type: "xxy",y: 123 } }
];
stoneData.map((stone) =>
switch (stone.type) {
case "moveTo":
case "lineTo":
console.log("case 1 - lineTo or moveTo" );
break;
case "quadraticCurveTo":
console.log("case 2 quadraticCurveTo ");
break;
default:
console.log("something went wrong");
}
});
输出
case 1 - lineTo or moveTo
case 1 - lineTo or moveTo
case 1 - lineTo or moveTo
case 2 quadraticCurveTo
something went wrong
与for循环相同
for (let i = 0; i < stoneData.length; i ++) {
switch (stoneData[i].type) {
case "moveTo":
case "lineTo":
console.log("case 1 - lineTo or moveTo");
break;
case "quadraticCurveTo":
console.log("case 2 quadraticCurveTo ");
break;
default:
console.log("something went wrong");
}
}
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