如何在 java 脚本中使用 "toLowerCase();"
How to use "toLowerCase();" in java script
我想让 inputResult 为 LowerCase 我的意思是如果有人插入颜色名称是小写还是大写都没有关系。我一直在尝试这个,但它不起作用:
checkResultBtn: function() {
var inputColor = document.getElementById("inputColor");
var inputResult = inputColor.toLocaleLowerCase();
var result = document.getElementById("result");
if (inputResult.value === "") {
result.innerHTML = "no value!!!!";
} else if (inputResult.value === pickedColor) {
result.innerHTML = "BRAVO THAT'S IT!!!";
} else {
result.innerHTML =
"SOMETHING is WRONG!!!";
}
}
var inputResult = inputColor.toLowerCase();
toLowerCase 需要 string。所以将 inputColor 初始化为
var inputColor = document.getElementById("inputColor").value;
那么你的 inputResult 将是字符串,你不需要调用 属性 value
解决方案
var colors = [
"red",
"purple",
"blue",
"white",
"green",
"brown",
"orange",
"yellow"
];
var background = document.getElementById("box");
var colorPicker = {
pickColorBtn: function() {
pickedColor = colors[Math.floor(Math.random() * colors.length)];
document.getElementById("pickedColor").innerHTML = pickedColor; //just to see what color has been picked
background.className = pickedColor;
},
checkResultBtn: function() {
var inputColor = document.getElementById("inputColor").value;
var inputResult = inputColor.toLowerCase();
var result = document.getElementById("result");
if (inputResult === "") {
result.innerHTML = "no value!!!!";
} else if (inputResult === pickedColor) {
result.innerHTML = "BRAVO THAT'S IT!!!";
} else {
result.innerHTML =
"SOMETHING is WRONG!!!";
}
}
};
您需要执行 var inputResult = inputColor.value.toLowerCase()
并从所有条件语句中删除 .value
然后它将正常工作:
var colors = [
"red",
"purple",
"blue",
"white",
"green",
"brown",
"orange",
"yellow"
];
var background = document.getElementById("box");
var colorPicker = {
pickColorBtn: function() {
pickedColor = colors[Math.floor(Math.random() * colors.length)];
document.getElementById("pickedColor").innerHTML = pickedColor; //just to see what color has been picked
background.className = pickedColor;
},
checkResultBtn: function() {
var inputColor = document.getElementById("inputColor");
var inputResult = inputColor.value.toLowerCase();
var result = document.getElementById("result");
if (inputResult === "") {
result.innerHTML = "no value!!!!";
} else if (inputResult === pickedColor) {
result.innerHTML = "BRAVO THAT'S IT!!!";
} else {
result.innerHTML =
"SOMETHING is WRONG!!!";
}
}
};
#box {
width: 50px;
height: 50px;
border: 3px black solid;
}
.red {
background: red;
}
.purple {
background: purple;
}
.blue {
background: blue;
}
.white {
background: white;
}
.green {
background: green;
}
.brown {
background: brown;
}
.orange {
background: orange;
}
.yellow {
background: yellow;
}
<div id="box"></div>
<div>
<button onclick="colorPicker.pickColorBtn()">Pick a colour</button>
<div id="pickedColor"></div>
<div id="result"></div>
<input id="inputColor" type="text" size="15" placeholder="write the color" />
<button onclick="colorPicker.checkResultBtn()">Check</button>
我想让 inputResult 为 LowerCase 我的意思是如果有人插入颜色名称是小写还是大写都没有关系。我一直在尝试这个,但它不起作用:
checkResultBtn: function() {
var inputColor = document.getElementById("inputColor");
var inputResult = inputColor.toLocaleLowerCase();
var result = document.getElementById("result");
if (inputResult.value === "") {
result.innerHTML = "no value!!!!";
} else if (inputResult.value === pickedColor) {
result.innerHTML = "BRAVO THAT'S IT!!!";
} else {
result.innerHTML =
"SOMETHING is WRONG!!!";
}
}
var inputResult = inputColor.toLowerCase();
toLowerCase 需要 string。所以将 inputColor 初始化为
var inputColor = document.getElementById("inputColor").value;
那么你的 inputResult 将是字符串,你不需要调用 属性 value
解决方案
var colors = [
"red",
"purple",
"blue",
"white",
"green",
"brown",
"orange",
"yellow"
];
var background = document.getElementById("box");
var colorPicker = {
pickColorBtn: function() {
pickedColor = colors[Math.floor(Math.random() * colors.length)];
document.getElementById("pickedColor").innerHTML = pickedColor; //just to see what color has been picked
background.className = pickedColor;
},
checkResultBtn: function() {
var inputColor = document.getElementById("inputColor").value;
var inputResult = inputColor.toLowerCase();
var result = document.getElementById("result");
if (inputResult === "") {
result.innerHTML = "no value!!!!";
} else if (inputResult === pickedColor) {
result.innerHTML = "BRAVO THAT'S IT!!!";
} else {
result.innerHTML =
"SOMETHING is WRONG!!!";
}
}
};
您需要执行 var inputResult = inputColor.value.toLowerCase()
并从所有条件语句中删除 .value
然后它将正常工作:
var colors = [
"red",
"purple",
"blue",
"white",
"green",
"brown",
"orange",
"yellow"
];
var background = document.getElementById("box");
var colorPicker = {
pickColorBtn: function() {
pickedColor = colors[Math.floor(Math.random() * colors.length)];
document.getElementById("pickedColor").innerHTML = pickedColor; //just to see what color has been picked
background.className = pickedColor;
},
checkResultBtn: function() {
var inputColor = document.getElementById("inputColor");
var inputResult = inputColor.value.toLowerCase();
var result = document.getElementById("result");
if (inputResult === "") {
result.innerHTML = "no value!!!!";
} else if (inputResult === pickedColor) {
result.innerHTML = "BRAVO THAT'S IT!!!";
} else {
result.innerHTML =
"SOMETHING is WRONG!!!";
}
}
};
#box {
width: 50px;
height: 50px;
border: 3px black solid;
}
.red {
background: red;
}
.purple {
background: purple;
}
.blue {
background: blue;
}
.white {
background: white;
}
.green {
background: green;
}
.brown {
background: brown;
}
.orange {
background: orange;
}
.yellow {
background: yellow;
}
<div id="box"></div>
<div>
<button onclick="colorPicker.pickColorBtn()">Pick a colour</button>
<div id="pickedColor"></div>
<div id="result"></div>
<input id="inputColor" type="text" size="15" placeholder="write the color" />
<button onclick="colorPicker.checkResultBtn()">Check</button>