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[dart/zh-cn]Fix bool convert of chinese version.

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Same to my last commit of english version, fix bool implicit conversions support of chinese version.
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OKry 2018-11-18 17:17:50 +08:00 committed by GitHub
parent 44537874c3
commit a54b3879ca
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1 changed files with 34 additions and 10 deletions
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zh-cn/dart-cn.html.markdown
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@ -176,23 +176,47 @@ example13() {
match(s2);
}
// 布尔表达式必需被解析为 true 或 false，
// 因为不支持隐式转换。
// 布尔表达式支持隐式转换以及动态类型
example14() {
var v = true;
if (v) {
print("Example14 value is true");
var a = true;
if (a) {
print("Example14 true, a is $a");
}
v = null;
a = null;
if (a) {
print("Example14 true, a is $a");
} else {
print("Example14 false, a is $a"); // 执行到这里
}
// 动态类型的null可以转换成bool型
var b;// b是动态类型
b = "abc";
try {
if (v) {
// 不会执行
if (b) {
print("Example14 true, b is $b");
} else {
// 不会执行
print("Example14 false, b is $b");
}
} catch (e) {
print("Example14 null value causes an exception: '${e}'");
print("Example14 error, b is $b"); // 这段代码可以执行但是会报错
}
b = null;
if (b) {
print("Example14 true, b is $b");
} else {
print("Example14 false, b is $b"); // 这行到这里
}
// 静态类型的null不能转换成bool型
var c = "abc";
c = null;
// 编译出错
// if (c) {
// print("Example14 true, c is $c");
// } else {
// print("Example14 false, c is $c");
// }
}
// try/catch/finally 和 throw 语句用于异常处理。